I was addressing the Puritans with impure thoughts who act on them despite the threat of religious repercussions. 
I think it’s safe to say that for as long as humans have been tool users they’ve been coming up with interesting uses for their built-in tools. I suspect you could go back 50,000 years and have a good time with Ugh or Gok, that is until the pathogens each of you carry that the other has no evolved defense against kill you both.
Hum. No.
According to Robert Lacy’s history of Saudi Arabia, the kingdom’s founder, Abdul Aziz ibn Saud (born 1875), was a bit risque in his sexual habits, in that he preferred to make love to his wives face-to-face; the “respectable” position among Arabs of his time was rear-entry.
The Puritans enthusiastically engaged in sex:
Yes, but nowhere in the article is there mention of Puritans engaging in a Kentucky tractor puller, a Dutch rudder, a Canadian porch swing, a toasted marshmallow, a Milwaukee blizzard, a campfire delight, a spicy gringo, a ramen yarmulke, a bumpkin plunger, a hot Richard, a Chuck Norris, a Leningrad steamer, a Mississippi birdbath, or even a Ben Franklin! So, the Puritans couldn’t have been too unpuritanical. 
They just didn’t write it down, not in this terminology, anyway. Perhaps because they didn’t consider it remarkable.
Hmm, so to them, these were plain vanilla sex acts. Interesting theory!
I am interested in your theories and wish to subscribe to your newsletter.
Yep, this is my theory.
Alas, for me it is theory only, not reality. For you see I took a vow of celibacy in order to cleanse my soul. 
(that sounds better than “too old to get any”)
I think this is only true if you remove any mechanical interventions from the equation. For example, we can be pretty confident that any positions that require a Sybian probably didn’t exist before electricity. Certain positions that require vibrators or even dildos probably weren’t practical before we learnt how to injection mould silicone. Stuff like Japanese Rope Bondage was probably around but the explosion of the internet has probably created brand new knots and positions that were far more advanced that what was previously being practiced. Maybe furries existed in some historical cultures but certainly not with the level of detail and technical innovation of modern fursuits and it’s hard to imagine there ever being such a vibrant culture prior to the internet allowing furries (or other sexual minorities for that matter) from finding each other and creating entire sub cultures.
I think if you restrict yourself to two adults in a bare room with a bed and maybe a chair or two, then yeah, most of the things a modern couple could do now were probably known 500 years ago but sex is a much more expansive activity than that and many of our modern expressions of sex would be pretty alien to our historical ancestors simply due to the resources we have easily at our disposal.
This brings up an interesting point. The OP doesn’t say so explicitly, but it put me in a mindset that has the Time Traveler going back primarily for some G-rated reason, such as research, killing some historical figure with the (misguided) hope of improving subsequent history, testing out a newly invented time machine, or whatever. And then, during the trip to the past, TT just happens to meet an attractive and willing partner.
In regard to mechanical devices, OP doesn’t seem to rule out that TT might take some kind of small, battery-powered toy with the intention of doing a little solo play in private. Let’s say he/she uses it daily and expects the trip to be a multiday thing. Why not pack the toy along with the change of underwear and toothbrush, if there’s room for it in whatever luggage can be taken, if any? And then, if TT happens to meet someone, maybe show that person something new, if it looks as if he/she could be introduced to the technology without freaking right out. Obviously, TT has to be mindful that pulling out a vibrator and turning it on in front of a peasant in the Middle Ages might very well provoke that person to freak right out and start running down the street screaming about the devil, and then TT all of a sudden ends up getting burned at the stake. But that’s a different question from the local being confused or disgusted by a sexual practice.
Or do something disgusting, like sleep with your own grandmother!
Wait, you think dildos are a modern invention? They’re not.
Indeed, simply being exposed to new ideas often creates demand.
Purely speculative, but I understand that there are sites on the internet that show activities of a sexual nature. I believe you people call these pornographic, or “porn” sites? And, I’ve been told that these sites often show interactive activities that are atypical and perhaps not familiar to the viewer. Said viewer, after viewing these atypical activities may think to themselves, “well gosh, that looks like jolly good fun, maybe I should give that a try.” And so, they do.
If this newfangled activity proves to be a pleasant experience, the viewer may be tempted to add it to their repertoire. Their sensual sonatas expand into sexual symphonies (in theory, of course).
People of antiquity didn’t have as good internet broadband as we have today and therefore would not have been exposed to the vast variety of sexual activities that many of you people see on a regular basis. No exposure = no familiarity = no demand.
My aged MIL lived in a very pleasant old farts’ home the last few years of her life. The average age there was upper 80s.
AFAIK she herself did not partake of the sexual opportunities there, but per the staff one heck of a lot of the other oldsters did.
As a man fairly likely to have a long life by male standards, I’m kind of looking forward to that myself. The goods may be oddly wrinkly, but my odds will be spectacular.
IOW: Come on in, the water’s fine. Almost no matter how old you are.
Obviously dildos existed before but the ability to mould silicone has allowed for dildoes in exotic shapes and flexibilities that would have been incredibly hard to create any other way and there are sex positions that require some pretty specialized dildoes to pull off.
What if our time traveler were to take an exotically-shaped silicone dildo back to the Middle Ages and is able to introduce it to one of the locals who, for the sake of argument, won’t give any special thought to the presumably weird material it’s made of? Maybe explain the substance, if asked, as sap from a tree found only in southern Africa Or whatever.
If you’re introducing the word “exotic” into the conversation, that implies we’re talking about something most people haven’t experienced. But that doesn’t speak to the question of whether any given individual would be open to trying it out.
That’s what I was going to say. I don’t think that the addition of electricity would create any new positions.