Umm, folks, a guy makes new spermies every 20 minutes.
If you want to smell spermie, there are special sprays you can get in gay men shops that duplicate the sperm smell exactly. I don’t suppose women would find this perfume attractive on ya? Do ya?
PS: To answer the next question in your mind, it was like 20 years ago when I visited a gay fella & learned about this cause he was like wearing it or something…
Well, Purplebear’s comments aside, I’ve faked it before and as far as I know, they never noticed. Why fake it? Well, it’s been a long while since I have, but mainly just because it’s not working out and I’d begin to get bored. Why was it not working out? Beats me… alcohol? Lack of desire? Fatigue? Anyway, it’s just as easy for a male to do a few quick thrusts and fake a moan at the end as it is for a woman to call out your name and say “Yes! Yes!” repeatedly.
Also, you have to scream really loud in their ear and squeeze em real tight while you simulate something resembling an epileptic fit. That adds a little distraction, which is a critical technique.
Then promptly roll over and fall asleep. It works every time. 
Dewt
johnboy, well… the only thing i can contribute as an answer to your question is this: my FB [f***-buddy, we were exclusive bf-gf, but aren’t anymore, but we still date and screw, it’s a strange situation] follows a pattern. He gets aroused, [therefore he’s hard], if he starts to feel REALLY GOOD during sex, I can feel him get even harder than he was already. He usually comes about a minute later, give or take several seconds. I can feel this when he’s on top, but i can definitely feel it about 10 times more when I’m on top. This is good for me so I can get ready. 
Does anyone else find a certain ribald amusement in Palmyra responding to the “whacking off” thread?
Sorry. Weak moment. Discuss among yourselves.
Veb