I think Gaston thinks that if you look sexy to him then of course, no matter how often you say you don't like it, you love the sexy perv talk and that if he just smiles like a fucking simpleton and does it enough times eventually you'll love it.
I know there's been a lot of sex in their relationship and he's told us all that she's a demon beneath the sheets but enjoying sex and being talked to like a sex object all the time are two very different things.
N.b. She is an arsehole but he needs to keep his stupid mouth closed and no more fucking licking.