We could also look at it from Han's perspective.
She pretends she doesn't care about him, even though he knows she does. She lies to him when he attempts to express his feelings for her (albeit poorly by accusing her of wanting him to stay because of the way she feels about him). She kisses his friend in front of him. And really is just kind of a straight up B to him through 1.5 movies, seemingly because of their class difference. Let's not forget that she likely has a huge hang up on the fact that she's royalty and he's a criminal.
It's only viewed as Han being aggressive and Leia finally giving in if you don't think that Leia actually had feelings for him in the first place, which she obviously did. I think Leia's character was proven strong enough at that point that the audience knows she wouldn't have let him be that way with her if she didn't want it to happen.
It's also not like Han slams her into a wall and shoves his tongue down her throat. Yes he blocks her path, and his body language is obvious, but his moves are slow and calm. And again, the subtext of them flirting since pretty much the first time they spoke to each other makes it more romantic and relieving than pushy or aggressive.
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