A friend of mine recently told me he has a health problem.
He spent too many years cycling and being on his bike competing and is now sterile. He can't have an orgasim and therefore doesn't produce sperm.
I've told him to stop his cycling as he does it 3 times a week 100kms each time.
I've got him on Siberian ginseng and a Australian (where we live) formula from the health shop for men and libido. Its got all the herbs in it for libido such as horny goat weed and saw palmetto. And he's also taking zinc.