Everyone, men and women, are bound to notice people of the opposite sex who are very attractive. However, doing so overtly and especially commenting to the person you're with is just crass and disrespectful. Once or twice may be forgivable, but if this is an ongoing behavior that he feels entitled to engage in, well, it would be a deal breaker for most. If a woman did that I'd quickly lose respect for her and see her as having no-class, no judgement or discretion, no loyalty... and I'd be out
see the review