Respected Doctor, First of all THANK YOU for giving Sex Education. I am a Male guy,Age: 24.I have a 3 Questions,PLEASE HELP ! I musterbate a lot but i am feard bcause the sperms/liquid is touching/mixing with my undergarments,cloths,bedsheets,or other cloths.& sometimes I keep my Underwear as it is in bucket of water in bathroom & unknowingly it mixes with my Sister/Mother/Father s clothes for sure. I do not wash my penis after masturbation. Question1: will my sister becomes pregnant?also her stomach is growing/enlarging,why? Question2: bcause I donot WASH my PENIS,& it touches my underwear whole night,will it cause HIV or any other INFECTION? Question3: will there be any problem of HIV/AIDS/INFECTION to my parents? I hope You will do favor for me.PLEASE. Yours Respectfully.