I think this Prezi Presentation will help you out!
https://prezi.com/dvk1-lldoidk/tissue/
Barrier methods. That's condoms and stuff. Withdrawal prevents sperm from getting in at all (theoretically) and the rest merely make ingress of sperm meaningless.
Smell , and Taste can be reduced
The answer is false.....................................
Answer:
the last one, Underwater weighing
