Consent is basically the decision or action of freely going along with something. But then there is the issue of the informedness of that decision. How much informed consent do you need? Well, that depends on the potential harm. Female sexuality is so harmless that none is needed, so we are talking about men only as potential offenders. Very small boys don't have the informed consent to engage in homosexual activity, in my view, because they don't realize how much it will disgust and stigmatize them later if they are not gay.

Then there is the issue of girls, where the informedness of the consent consists of knowing how much value they are giving away or how much it will harm their reputation. Evolutionary psychology tells us that in practice this informedness comes naturally with puberty, as it consists of psychological adaptations that manifest then, so I don't see a need to draw a line higher. Except we also need to consider the interests of the parents, so it gets more complicated. Parents reasonably want to control the sexuality of girls and keep boys away from homosexuality until it is futile to control them any longer. So I see an age of consent at 12 or 13 as sensible, of course only applicable to male offenders. And it needs to be of a non-hysteric kind where we don't have draconian punishments and don't pretend it is rape or abuse when consent in its basic form was given.