Crotch watching is real. Both sexes do it- a lot.
I don’t get why a man should hide his sexuality when women mostly do everything they can do enhance their cleavage, and boobs too if they have them.
I would say though, that having a stiffie running down the side of ones trousers is distasteful, but a decent bulge (normally just subtly hidden, yet subtly exposed by certain stances, is what women like to see. Fantasising puts their brains into overdrive.
And an observation, women are as stealthy with their bulge watching as they are with the information gathering component of many innocent “idle” chat/questions. I.e, by the time you realise what’s going on it’s too late! (if a man realises at all.)