Generally less is more. Like the less clothes a girl is wearing the more fun you will have, but this photo is hot and the girl isn’t even completely naked. I think a bikini like this let the imagination do a little work and very often the imagination can be even better than the real thing.
This chick look absolutely perfect and I’m sure in your head you invasion her as the perfect little slut. Derek the guys who sent us this picture doesn’t see her as the perfect slut, he just sees her as a slut that fucked his (former) best friend. It better to keep her in your head, because in there she can stay perfect.

