You know what, I can't find any contemporary sources that hate on gay men directly and I'm getting tired of reading this junk so I'll leave it at "just trust me bro".

I will say that they saw marriage as between a man and a woman for the purpose of breeding good citizens for the state. People who wouldn't pair up and reproduce were punished socially and maybe even legally. So you can imagine what the Greeks thought of gay people (how many ancient gay spouses can you name?)

...Then let us now proceed to marriage, and teach persons in what way they shall beget children, threatening them, if they disobey, with the terrors of the law.

Cle. What do you mean?

Ath. The bride and bridegroom should consider that they are to produce for the state the best and fairest specimens of children which they can.

Source