Weird question, but I guess it boils down to which is the inherently more private act to you. Create whatever convoluted hypothetical scenario you need to to put yourself in the position of, say, a coworker walking in on you either taking a dump or having sex. Which is worse/more embarrassing?
Let’s make it more even and say that you’re naked either way. (You are about to take a shower or something for the dump one)
I voted "being walked in on during sex "
(but some of my fantasies do contain the swedish bikini team asking if they can join the fun…so sometimes it would be okay to be walked in on during sex .)
others seeing me using the toillet or anything else where I am naked would never be a issue for me
I’m Dutch by the way
This place where a co-worker might walk in on you having sex, are they hiring?
Yeah, and I would probably like to avoid the place with the unlockable stalls/bathrooms.
Depends on whether the person is attractive.
Coworker? I, too, am curious about what sort of place I work where it’s likely I’m going to be having sex. I can’t imagine any scenario in my current workplace where I wouldn’t get fired. (OK, I’ve imagined quite a few.)
Having said that, I was recently walked in on while having sex. I think the walker inner was the most embarassed out of the three of us. Takeaway lesson: This is why we knock.
Sex with yourself or someone else?
Worse for me or for the intruder?
I’ll say sex, but only because my wife is very modest. I couldn’t really care one way or the other. I’ve dumped in front of people before.
Clearly, the posters who voted for “taking a dump” never had a 3-year old walk in on them having sex.
Or a college roommate, for that matter.
For me it’s dumping. There’s no secret shame in having sex!
I’ve had a roommate walk in on me having sex. Not the end of the world. You’re always with at least one other person while having sex, so I don’t consider it that “private.” The bathroom, however, is a one person activity and should stay that way.
People don’t sue you if they had to witness you taking a dump. But they might claim that you having had sex, where they could walk in on you, consitutes an unsafe work environment, sexual harrasment, or worse.
Toddlers witnesses might be scarred for life. Or not, but mom and dad are afraid they’ve scarred them even so.
Besides, no one can blackmail you for taking the occasional dump.
Meh, pooping is grody and sex is awesome.
Sex.
But that’s because I’m married and if somebody is walking in during sex, it’s either:
None of those are optimal.
If I’m walked in while pooping, it’s my wife. Not optimal either, but whatcha gonna do?
I voted pooping.
The only time I’d be stressed out about the sex is if it was one of my kids walking in. Hopefully we’re semi-covered and can pass it off as “wrestling”. 
What about if you are taking a dump as part of a sex act? That would suck.
I said sex.
When you’re dumping all your bits are sort of contained, hidden in the toilet (unless you do something VERY different from what I do while pooping).
During sex who knows what body part is going to be racked out, stretched into a weird shape, hung up in a trapeze of some sort.
Clearly sex is worse. As noted by the previous poster, being busted dumping WHILE HAVING SEX would be the worst. (Not that I have any experience with that particular act, but I can’t imagine having your mom bust you during a Cleveland Steamer is good.)
I’m trying to figure out what the secret shame is in taking a dump.
If there’s one thing that I’ve learned from great literature, it’s that Everyone Poops.
Depends. Who am I having sex with?
And did I have Thai for dinner last night?
I’ve got 3 kids. Getting walked in on when I’m on the toilet is par for the course.