Refers to just-minuscule reimbursements/favors here and there dat a chick allows you for your help, and without her even giving you any a** in da bargain.
I agree dat a girl's body is her own, but if she doesn't reimburse you adequately --- or at all --- for requested help and also refuses to spread her legs for you, then it does indeed seem like a "bottomless pittance" deal to me.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi