No, that clearly isn't what Silas is saying there. He is talking about hints that actually give a deceptive indication that sex is likely to be granted if favours are done.

Well, it wasn't clear to me -- especially since that would make it equivalent to men's false declarations of love or resources to get sex... and the information allowing men to do that is just as available as the information that allows women to know they could false-promise sex to get resources.

And in both cases, the behavior is looked down on by society.

So, it would've been an odd interpretation for me to read into what he said, given that I was trying to interpret his evidence in the best possible light, not the worst one. ;-)

(i.e., refute your opponent's strong points, not the weak ones)