Happy to answer your questions, it seems to be quite a taboo subject, I suppose because if anything goes up your butt your gay. (lol)
would just putting vaseline on the pill and pushing it work?
Vaseline was what I used, I suggest putting some on the pill and your butt.
Have you tried taking a first pill orally and taking another one rectally later to boost the effects?
I have not, I once did about 200mg bk-mdma suppository followed by a few mg of MA shortly after, but that's it.
I would imagine it would work though.
I don't have access to pure MDMA, could XTC pills be laced with stuff that would be dangerous using that way?
Well, you don't have your liver to filter out stuff, but I as long as you feel safe taking it orally I wouldn't worry about using it as a suppository.
Edit: Does it hurt
Well my first experience, I used a pill (no gelcap) and that did burn. There is slight discomfort after insertion, while inserting make sure to relax.
Once it starts to dissolve you will definitely fill it, I would say it's just slight discomfort though. Do expect diarrhea though, I suggest inserting with nothing in your bowels.
I find that Amphetamines in general make you have to take a dump, this is increased this way, for best effects you wanna refrain from taking a shit for at least a couple hours after insertion. After about the initial 30-40 minutes you will feel it come on all at once, and I find that you generally peek sooner and harder, but not for as long. Once the full effects hit you, you won't even remember you need to take a shit, and the discomfort will go away.
I'd say the worse side effects would be taking a shit the next day.
If anyone else has any questions feel free to ask, I'll do my best to answer.