> Repeated unwelcome advances are not OK even if the person is single.

Definitely agree with you there. I added the extra "made clear they had a significant other" since it would help to push the line even further into unacceptable territory. I don't mean to imply that the relationship status is a necessary condition for unacceptability. The fact that women have learned to use the existence of an SO as an escape rather than outright saying no reflects poorly on the men that caused the learned behavior.