During the filming of Scary Movie, Lindsay Lohan was supposed to kiss Charlie Sheen. She flat-out refused as he had a rather sleazy reputation and was notoriously wild; a very “sex, drugs and rock ’n roll” type of lifestyle.
Not trusting where his mouth had been and what it had been up to, Lohan requested a body double be used for their more intimate scenes. The two later did become friends, once even having a drinking contest at a party in which Lohan reportedly “drank Sheen under the table”. Sheen later admitted that she had to “bring him to bed and even tucked him in” — the legendary party animal was tremendously impressed by his much younger co-star!
But yeah, early on, it wasn’t out of respect that Lohan refused a certain scene — it was, initially, out of disrespect for her on-screen partner’s wildness. In light of all that’s known about Sheen, I really can’t blame Lohan for her reluctance.