I used to put it on my scrotum. The skin is thinner there and should absorb more of the testosterone, though I don't know by how much. They probably don't recommend it becuase of the burning sensation--the scrotum is very sensitive, and most consumers would be turned off by this, especially for lifetime treatment. I didn't care and did it anyway, but ended up getting jock itch, or whatever you call it. I used Testim, which when applied there never seemed to fully dry. Anyway, I'd say go for it.