I've seen girls keep photos of guys they had fun with in the past or photos of celebs they find hot saved on cellphones. Tit for tat. If girls can go gaga over guys' booty why can't men? When women fought for gender equality, I took that to mean equality both ways. If we want to be able to oogle a cute guy's butt, then we shouldn't condemn guys for it. It all depends on what each person expects of partners and themselves. If a female does not like it and she does not keep photos of former partners herself, then by all means, fairness and respect both ways. However, there are relationships where looking at a cute behind is not offensive to either partner so it all depends on each person involved.