Sex on E is one of the most amazing things one can experience. It can be a little tricky, but it's worth the effort. I'm going to offer that there are three keys: experience, preparation, and a sympathetic partner.
Reading through this thread, I'm reminded of how differently people respond to various substances. Some mention the come-up and come-down, but for me it's the peak; I tend to be a bit queasy on the upswing, making the stimulation and motion of sex challenging, and I can be too mentally scattered and physically spent on the downswing, but the tactile intensity and focus of the peak is perfect. This is why I say experience helps, because it's only by trying different approaches, to timing and other elements, that you can figure out what works for you.
Preparation can be crucial, too. While good timing can go a long way towards producing erections, taking L-Arginine for a couple days beforehand also is helpful, as are a low dose of Cialis when I drop and a small hit of marijuana just before getting undressed. Being ready with other necessities, from porn to toys to sexy clothes, also can make a big difference, (and I HIGHLY recommend having a good cock ring at hand). What works while rolling may be different from what works at other times, so this overlaps with experience, but the ideal window may be relatively short, so not losing it by scrambling for things you want or need to help make it happen is important.
Because various factors can make such a difference, an understanding partner can be the essential third ingredient. It seems that sex while rolling is less of a challenge for women, something more of a mood issue. Having a partner who is sympathetic and motivated, who can be patient as needed and responsive when the time is right, and who is happy to work with you regarding the other details, play along with what works for you, can be the make-or-break ingredient.
Receiving oral while rolling can be truly mind blowing! My girlfriend becomes especially capable and ambitious, and when I feel my head pop down her throat it is a divine experience. She also tends to get impatient, however, and wants to move to intercourse sooner than I'd prefer, but this can be a good thing. Everything is so amazing, and I enjoy providing and sharing her orgasms so much, it's very tempting to just drag it out as long as possible, but it also is easy to let that climax slip away. Whether it's overheating from all the activity or just overstimulation, (or the pot wearing off), holding off on climaxing can mean losing the opportunity, and you may find yourself ready to go but unable. Those accelerating hip motions that should push you over the edge may prove overly taxing and actually counterproductive.
A couple suggestions that work for me in addressing these difficulties. First, as far as effective positions go, a good one is a scissoring one, with her on her back and me on my side. This allows for lots of control of motion, depth, variation of speed, etc., while keeping my exertion level to a minimum. Second, a great sequence is cunnilingus-fellatio-intercourse. I can zen out and go down on her for thirty, forty minutes straight when rolling hard, which is very satisfying for me and typically gets her off several times, although the zen state doesn't always keep me hard. Coming out of that and going into a serious blowjob brings me back to life and resharpens my focus, and I can take that intense arousal and go into intercourse with no reservations about heading straight into my own climax. If I am anywhere near my peak, this almost always works.
