Just perusing some stuff...
U of Virginia study:
U of Texas Austin study:
http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/mere%20presence.pdf
Basically, the presence of opposite-sex others enhances a woman's attraction to a man.
U of Oklahoma study:
http://pdfcast.org/pdf/who-s-chasing-whom-the-impact-of-gender-and-relationship-status-on-mate-poaching
U of Virginia study:
"The shocker was that the women who found the men most attractive of all were those who weren’t sure just how much the men liked them."
http://homepage.psy.utexas.edu/homepage/Group/BussLAB/pdffiles/mere%20presence.pdf
Basically, the presence of opposite-sex others enhances a woman's attraction to a man.
U of Oklahoma study:
http://pdfcast.org/pdf/who-s-chasing-whom-the-impact-of-gender-and-relationship-status-on-mate-poaching
"Single women were more interested in poaching an attached man rather than pursuing a single man... this indicates that single women are more interested in pursuing a man that is less available to them"
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