Single men / men groups being denied entry to resorts and naturist events is a discussion that comes up again and again, and all the arguments I read for and against it are usually valid. But the truth is that even I, a 24 old man who in no way feels threathened by single men laying on the beach or hanging out in the pool, often come across situations where the saturation of men is uncomfortably high or very out of place for the situation. Even on regulated events aimed at kids and families in large swimming pools, I've come across men hanging at the side of the pool looking their eyes out while not talking to anyone else or contributing to the open atmosphere naturism is known for.
Again I totally understand that this is discrimination, but naturism is family-friendly and many resorts that are popular with the younger and family audiences like to secure that positive atmosphere for the larger group so that it's not spoiled by the (absolute minority!!) group of single men with bad intentions.
Valalta is on my list of places I'd love to visit sometime though, I've heard it's huge and a vacation destination for quite a few young people which are rare to encounter elsewhere.