Er, "convincing" most guys of that takes around 17 milliseconds.
Perhaps. But it also brings to mind this scripture.
Romans 1:26 For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature: 27 And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet. 28 And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient; ...32 Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them.
Perhaps guys just see two beautiful women and can visualize themselves on either side of the equation. Instead of seeing that it is unnatural and makes a mockery of the intended use.
That scripture indicates that we might be a lot more "reprobate" than we would like to imagine.