if ur not tolerant 5mg should do it. but its seriously not worth it as other ppl have said. i used to love that i could bang my ex for hours, im sure she wonders whats up with her new man. but all in all its not worth it, and to tell u the truth, my favorite part of it was in the morning when i would get mornin head or have wake up sex i wouldnbt be high and i would cum fast and was more sensitive and it was way better. i used to look forward to it.
also at first i would say i was more honry, plus opiates give u the NRB( no reason boner), but over time you kinda dont care. i can definitly tell you this past 2 years of fucking my life up(after a year or so of bring clean) ive jacked off mayyyybe 75 100 times. obvisouly way less then one would normally. itll take ur sexdrive... as all drug do with many thing once the fun is over.
all in all its not worth it. try a 2.5mg.seriously then 5mg if it doesnt work 7.5.... stop there