To me, its this myth "Men just want Sex". Its incredibly reductive&dishonest to treat Sex as a physical act in isolation from all the other moving parts involved. Sex is an opportunity to be vulnerable by being emotionally&physically intimate. If Men only really wanted the physical act of sex, then most men would go to Prostitutes and be done with it and not chase women.

The reality of being a man is that, we don't have many avenues to be emotionally vulnerable&intimate outside relationships. Most young men are in a rat race to get women, so we don't have the time to be close to each others in the same way as Women are. Men are extremely competitive by instinct, we do not feel comfortable admitting that we're weak to each other. Its an unfortunate limitation of our biology.