At climax, the man ejaculates through powerful, quick muscle contractions 1 every 0. However, have you ever wondered what sperm smells like? The normal smell of sperm is much like bleach or chlorine, which may be picked up in hospital, swimming pools, laundry room, etc. The ammonia and other sterile-smelling alkaloids in semen give it the bleachy smell. However, 1 in 5 people cannot perceive this smell, which is why some men and women don't think sperm smells at all.