I'm 22M, 95kg (210 pounds), 180cm (5'11) and I've always been able to have sex for like hours, I just couldnt finish through regular sex. About a year ago I went through a period where I'd be ready finish before sex even started, and I knew I couldn't go long.
This went away and I could have sex normally for some time, but a few months ago I was having it and randomly got super close to coming (we were about 20mins in) and it freaked me out. So I started masturbating before sex which helped. Yesterday I went to have sex after not doing anything for 4 days, and I could last about like 2 minutes (except in doggy which I could do for a while) it was almost like I could feel the pulses that you get before cumming. Anyways that session ended depressingly, and I noticed that I can masturbate, then masturbate and cum again within like 10 minutes of masturbating which worries me that the next time I'll have sex after masturbating it won't help.
I posted this awhile ago when my 1st episode happened and some guy said he randomly got more sensitive too and he was never able to go back which freaked me out. Does anyone know what causes this? And how I can go back?