The fact that they wanted to seduce you is not necessarily objectification. For the most part, women are more likely to be drawn to the total package and not just the body it comes in, although the hunky exterior was no doubt a factor.
As I said, women get bored with monogamy more easily than men and if they are in relationships where they don’t feel desired, then it makes sense that they’d try to elicit the desire of someone else. It also makes sense that people who know each other well are the places where infidelity tends to occur.