If that's the case, pretty much any bikini picture is questionable. This isn't titillating enough.
Women tend to wear swimsuits when going to the beach. Making eye contact, raising an eyebrow, and imitating paizuri is a bit less socially acceptable in my experience.
Ah yes, holding a long object between your breasts wearing only a bra, that very normal and non-sexualized thing we do all the time when not trying to raise arousal. Totally akin to wearing a swimsuit at pool or beach.