And from another post:

You see love is also hormonal and chemical. Your semen has hormones and chemicals that will make a woman love you. Inseminate them regularly and they will stick to you like glue.
I can't even work up a good mock.

IIRC the Magic Sperm method only works for James Bond. And he's a supernatural being, of course. (ObGoodSF: "The Jennifer Morgue," Charles Stross.