Hopefully this is the right place to ask this kind of question. I am a 19 year old male. Recently, I've started experiencing a strange (almost pleasurable?) tingling/vibration in the right side of my penis shaft during masturbation, primarily while near ejaculation. Afterwards, the same area feels somewhat sore. This has been going on for a few days now, and is very worrying to me. I typically masturbate 2-3 times a day, which at first I thought may be the cause (maybe giving it a rest for a few days could help?), but a month ago I also started taking 1.25mg of finasteride a day, so I'm also concerned that could also be the cause. Has anyone experienced this type of effect from Finasteride before?