How healthy are you? Do you have any heart problems or are you reasonably fit?
Viagra can put a strain on your heart so can MDMA so add them both together and the effects are doubled.
Its fairly common that people use viagra + stims together - word of advice is if your going to be having sex for hours on end remember to use protection and lube (if needed :D).
I'm 21 I weigh 260 LB's (I am very height & weight proportionate) I can run 2.6 miles in under 18 minutes. I usually work out and do a healthy amount of sets of reps. I would say I'm healthy (I just recently got back into working out so I'm a little over weight I would say). Body % Fat would be 20% (truthfully lol).
I wanted to try to use it together with my fiance & I but knowing how these 2 drugs work it seems they might cancel each other out? I was searching on the forums and it was helpful but having a Bluelighter explain it to me right now or sometime in the future would be more re-assuring.
I prefer Cialis. Have used many times and the only ill effect is I usually outlast my woman which makes being super horny and hard a problem. You can take care of this with some lub and porn though.
You have to experiment a little to see what amount of Viagra works for you while rolling.
Personally I find taking viagra prior to or during the roll changes the quality of the experience. I find it slightly speedy.