Sir, I am 22year guy & I used to masturbate on regular basis from age of 16. Actually we are living in joint family. Generally on not getting time to do it in home, but I still find times to do it while bathing. We have small home & single Bathroom. Mumma, Sister & Bhabhi all of them used to take bath right after me. As I grew up I started to feel tense for doing same. I want to know till what time Sperm lives? So that females of family be safe. Is it safe for me to do the same stuff at same place?

Yes it is safe; it cannot harm other members of the family.