If Han Solo were any other man, he might pause to think of the woman back home, for a moment, and it might make him stop. But Han Solo has never been that type of man (and he sees the way Leia looks at Luke and he knows) so he doesn't.

His hands shift to rest against her thighs as he leans down to return the kiss.

It's not wild and rough and breathless (not this moment anyway) but it doesn't have to be.