Hi, I am 28 yrs old married man. When I was having sex with my wife last night, I asked my wife to  rub my penis and she gradually started with a gentle speed and later done it vigorously( Something similar to the masturbating). Finally sperm come out and the same time some blood is oozing out from the penis(Internal). She has been doing the same thing over the years and I experienced a considerable higher frequency this time than earlier and a tight grip.

I cleaned up quickly and see whether there is some indications outside the penis and nothing was visible. Everything was normal.

Please let me know whether this is a part of kidney disease or something wrong with the sex habit.

Thank you!