I'll try to answer this question. The following is my opinion.
For "most" men it is kind of exciting to think of a woman making love to or having sex with another woman. It is taboo and generaly anything taboo tends to excite people.
In addition, to a man, a young, healthy, fit woman is a thing of tremendous beauty and men have no trouble understanding that even another woman can see what HE sees and can appreciate the awesome beauty of a woman. Taken a step further, the same can be said of understanding how a woman can be turned on by another beautiful woman. What men have trouble understanding though is how a woman can be attracted to an unattractive woman which seems to be very common when you look at many lesbian couples.
Here's a question:
Why do so many men fantasize about a FFM threesome?
I'll give you my opinion on that later. Let's say it has a lot to do with curiosity.
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