I'd never admit to using a controlled substance... but my expert druggie friend has whispered the following information in my ear /wink.
1) X is not just a party drug, its also a great sex drug
2) X can be pure, but it's often cut or entirely counterfeit. Go to
www.dancesafe.org to learn more about this topic.
3) Good, potent X (I like the "superman" X myself) produces a variety of sexual results. In my friend, one hit (but he always takes X in half-tabs) creates a feeling of well-being and a hypersensitivity to being touched. Sex at one full hit is incredible.
4) After my friends second hit (again, taken in half-tabs), it becomes very difficult to orgasm, but erections are still nice and easily controlled. You can plateau forever (the woman will think you are a god) and not ejaculate.
5) After my friends third to fourth tab (closer to four), erections can be shorter-lived and orgasm is truly impossible. I have mixed feelings here... if you've been doing a half-tab every 30-45 minutes and gotten 3.5 or 4 hits in you, then you've probably been screwing for a solid 3-4 hours (my "friends" record is 9.5 hours). The less-than-granite erections may just be from 3-4 hour hours of solid stunt-fucking. At that point though, you don't care because you're overwhelmed with a feeling of well-being. If you're with a multiorgasmic girl who is just soaking up the orgasms, she'll gladly help you build back up anyway. It's not unusual for the girl to have lubrication problems at this point and she can often be overstimulated anyway. Worst case, you put a movie in, and spent the night laughing about the fuck-fest you just completed.
6) Now... for women. I've seen one of two things. Multiple orgasms, even if the woman is normally a one-shot deal, are common. Low doses of X increase sensititivity and lower inhibition -- both condusive to multiple orgasms.
7) For some women, more X can produce the same effect that it does in men -- a long, strong sexual plateau, but no orgasm. Other women just keep on having more (and even stronger orgasms).
8) At the highest doses of X, women will either be shut down or ridiculously sensitive -- I've seen both. I've seen, umm... my friend... has seen examples where the woman is overstimulated by what should otherwise have been a mundane orgasm. A lot of the "come hard" clues -- quivering thighs and arms, the scent, and the headrushes are common.
So anyway... yes, sex on X is an amazing thing. Don't be surprised if your libido is completely trashed for 24, 36 or even 48 hours after used. It will come back.