Maybe some vendors are just being extra cautious, for the sake of those people who are browsing at work. A bikini is fine. But a super close up of a crotch, even in a bikini, can be a bit much for the front page. :)

You can't please all the people. Some will be offended by excessive cleavage, and some will be offended by attempts to "reduce" the visibility of excessive cleavage. Hence the inconsistency in the way vendors choose to advertise. Some will be overly cautious and others will stay just within the ToS.

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.