There's the old adage that there's safety in numbers, and maybe these men had never been to a brothel before and wanted to check it out, but were nervous.
I know I was intimidated during my first visit, because it can be overwhelming. You're suddenly surrounded by stunningly gorgeous women who are available for instant sex and companionship, and you're not quite sure what to do with the information as it hits you.
Everybody has there own reasons for visiting, and I imagine there's a minority who just want to visit to hang out and see what's it like before either deciding to return individually or whether to return at all.
Plus, there's a reason why people call a certain part of our anatomy the "dumbstick." Sometime it just gets in the way of logic.
I wouldn't take it personally or be confounded by it. And Ironman also has a valid point. None of the women are any less desirable or any less regarded as erotic goddesses by the majority of people who visit.
