Changelog suggests that came in at v0.4808 - what version are you on, the latest?
Just checked it for you, and it works fine, AFAICS.
After 2 drinks, sitting at the bar, Kate has to "just wait a bit". There are then three different possible developments, which can arise in any sequence (so, best if you get Kate to the bar before it's too late in the night, and before she's had lots of other sex - ah, maybe that's your problem?: - if you get Kate to the bar late, at a time when she's already had a bellyful of men?):
Sometimes *nothing happens", as you say.
Sometimes Walter turns up, looking to punish Kate in his usual way ... Kate has to scare him off with Response/Option 1.
But other times, "A man comes up", saying "Hey baby, I noticed your b*tt from afar ...." (he's quite romantic)...
Kate then has to say "(1) Thank you, I already ... enough". (Response/Option 2 dismisses the amorous newcomer.)
The guy then keeps trying - "a standing prick has no conscience", as the saying goes - and says "Then maybe we an have a little play, ... in the toilet" ....
Kate (obviously) then has to "Accept his proposal". (Talking about a boyfriend - her other response - scares the guy off.)
That leads straight to the club toilets, and if playing the MAXI version, the option of two men. If using the plain U version, just the same guy who propositioned Kate for sex at the bar.
Whether it's *n*l sex, I'm not sure. Maybe "to your ass" is used loosely in this case ...
Good luck!