"Does the recent coining of "fuckboi" show that 'sluttish behaviour' (for want of a better term) is seen as poor form by both sexises?"
I think, from what 17 year old DD says, this is the case among her peer group.
"A woman who wants sex tonight but isn't fussy about who with will have an excellent chance of getting it, probably with a few free drinks in the process. A man who wants sex but doesn't care who with is much less likely to succeed (without paying for it!), will have a much harder time achieving it and will certainly be buying the drinks rather than receiving them."
I'm not convinced that this is true. However, what do I know? I have been out of this game for a long time.