I don’t know that the concern about gay adoptions is over normal male kids. But a lot of young people are fragile, and can be influenced either way. Not just about sex, either.
Studies have shown (duh) that children do best and need a mother and a father. Sometimes a parent dies and that actually harms a child a lot less than single parenthood. Also being raised by homosexuals makes children much more prone to all manner of dysfunction including being homosexual, promiscuous, drugs, alcohol, etc.