Gay society has adopted many of the values and prejudices of the straights even when they do not apply to homosexual s.
Young and proud males feel that they deserve to have free sex.
The hustlers of old stood on specific street corners waiting for johns.
Often, they did car dates - hopping into cars whose drivers slowed down to let them in.
When they grow older, the idea that they have to pay for if they want to get laid galls them. The client who pays for sex usually gets exactly what he wants, with a minimum waste of time, whereas the cruisers in any venue, have to make do with whatever is available to them on at a given time.
From its inception, the gay movement has advocated that persons can do with their own bodies whatever they want even change their birth sex.
Conducting business in the streets was extremely disadvantageous for them.