Well you are having sex with the man, so I'd imagine you'd prefer it to be described as such.

[Her gaze turns to him, and she almost wants to laugh at how he's reacting.]

I don't have a problem with who you sleep with. I'm not going to jealous and vindictive, but I'd rather know if you're intending to continue to see him after the wedding happens now instead of after the vows are said and done.