from my personal experience when someone is make a move or being flirty like that. i just said something that shows im happy sexually with my wife.

back then i got a female colleague who started talking about sexual topic in general and im pretty open to talk about it. when she started navigated the conversation to be more flirtatious and sexual, i just casually mentioned "i really love when my wife is on top, it feels so good i can't last." and normally ppl got the hint.