I'd say what Gilgad is saying is true. His girlfriend obviously follows her, and so does he.
Therefore, this is not a sexual arousing image. As the girl is in a bikini, just like girls do when they go swimming?
1. Girl in a bikini is reality.
2. You cannot walk around naked. But if you walk around in a bikini that is allowed, so Gilgad signature is not in anyway breaking rules.
3. Your signature is a Pornographic Category. Also known as Hentai.
Sources
A Pornographic Website. I choose not to take a picture of the category cause that would BE Breaking the rules.