There's actually a condition where a some males lack the enzyme necessary to convert test into dht. Dht is highly androgizing. They are often raised as girls. Sometimes at puberty, they produce sufficient testosterone to cause them to become straight males, but not always.

The problem with dht is that it's not really a circulatory hormone. It's typically created and used locally in tissue, so I'm not sure whether injection is a ln option. Never looked at it though.