Hi there!
Let's first have a look on what you are planning to do.
If its a regular night trip or if you just want to take Mdma for a sexual trip.
If its the first one, let me say that I think you will be good till 120mg. But I always take a little dose of Viagra to achieve that the soldier works properly. :D I dont like that kind of experiences by the way.. I enjoy them yeah, but I prefer what I am going to say next...
But if you are planning a night just to take MDMA and have sex, let me tell you something.. I dont know why people looking for this take too much... :D I always took no more than 80mg/90mg (good MDMA) for a sexual experiences..I think in that range of dose, you have all the good of the MDMA and you dont get that little friend down there if you know what I mean (lol, you can get hard easily with that dosage)
Also you still have a nice body feeling, and when you achieve the sexual plateau you will get sooo incredible good! :D
So , you have to know what are you planning to do..
PD : I had to say that I am a boy that easily get a boner so, maybe that only my experience.
Sorry the english :/