How was it forced?
While I do agree you should always be able to decline/stop sexual encounters, Falesha's sex scene is NOT forced. You can choose not to help her move.
And though I do think you should be able to help her AND decline her sexual offer, at the same time, this is a horny time game; kinda get what you ask for as far as everything leading to romance/sex.
I'd change the Falesha scene, but I wouldn't be mad if the devs didn't... It's a non-issue.