For all the young women who come to this site using this search phrase:
"Does semen (or sperm) make your teeth whiter?"
No, sweetie. Nor does it prevent breast cancer. It does not make you taller, nor your boobs get bigger. It does not clear up skin problems, help with headaches or make you lose weight.
It can, however, make you very popular. It can also give you STD's in your throat.