I am somewhat reluctant to share some of my/our tricks, due to the nature of them. The most important thing you will need, other than the MDMA, is a partner(s) that you trust 100%. A partner that you won't feel weird with later on.
1: vicks blown onto partner's anal sphincter. I realize how this sounds. Trust.
2: for men, have your partner hold and aim your penis as you urinate.
for ladies, sit backwards on the toilet, and have your partner run an ice cube down your back as you go.
3: have your partner stand in front of the sofa. Face to face, cradle the back of their skull, on both sides, with your thumbs just behind their ears. Pick them up....not literally. Just enough to take some of their weight off of the floor. Hold them there, your face an inch away from theirs. When you're ready, mildly blow a puff of air on their face and release your grip.
4: get a pack of large condoms (I prefer Trojan Magnums) and some lubricant. Roll one over your partner's foot and massage with the lube. Amazing.
5: I enjoy having the underside of my penis being smacked with a horse rider's crop. For me, it is sensational.
6: cotton gloves, wet them lightly. Put one in the freezer until it is very cold-not frozen. Microwave the other for 30-60 seconds. Rub your partner's back with them.
I am curious if anyone else has done any of these. I welcome all feedback, but don't be rude.