Answer:
Try to eat more fruits and some vegetables, and make sure you stay away from asparagus. Fruits, fruits, fruits! Unless, of course, you like asparagus laced semen over sugary candy-tasting semen. Pineapple juice is good.
Oh, and this also works on girl secretions. The girl's cum, if you are going to preform oral on her and you don't like salt ;)
If you do not like eating fruits and vegetables a lot there is something else. My ex always commented on the real nice taste of my semen after I had several glasses of sweet lemon ice tea for dinner or something.
I have also heard that pineapple is the most "powerful" fruit to eat when it comes to that.