Ever since i was young i flexed my penis and legs when i came. I did it during the whole time while masturbating . It felt better and made me cum quicker. i grew up in a house where nobody knocked the door so i always rushed myself to ejaculate. Holding my breath helped. Sex is hard because its almost impossible for me to cum during sex. i can only do it when im not wearing a condom and flex my body in ways that makes sex not fun. i only came using a girls vagina 4times. im 21. i've slept with a lot of women. but usually i was able to blame the condom for not being able to cum so i just got handjobs or blowjobs after. But recently i was in japan. and slept with a girl who said she doesnt like when a guy can't cum with her.  i've always had the feeling guys like when they can cum inside them (condom on) and i never could. i want to fix this!!! i tried just masturbating without flexing but then i cant cum. the longest i tried was a hour and 20minutes. i noticed my penis was getting numb so i stopped. (it actually got a bit swollen for a day)  i will get close to cumming when i dont flex.b...ut if i dont flex i dont cum.  Any Advice?!!?!