The researchers measured the participants' hormone levels at two points during each women's ovulatory cycle and then asked them to rate their own physical attractiveness. The women also answered survey questions that measured their propensity to cheat on their partner.
It was found that a woman's estradiol level was positively associated with self-perceived physical attractiveness. And, women with higher levels were also reported a greater likelihood of flirting, kissing and having a serious affair (but not a one night stand) with a new partner.
The conclusion reached was that highly fertile women are not easily satisfied by their long-term partners and are motivated to seek out more sexually desirable men.
Now I wonder if this latest info gives us a new excuse to make cheating okay? I suppose if you are looking for a reason you can always find one.