not wrong at all. Have you tried talking to SO about it? I'm in a some-times kinky relationship and I like the sometimes part. BDSM fulfills we in a certain way, tender love making meets another need, and being bent over the bed and fucked hard is sometimes just what I need. IMHO, vanilla sexy can be kinky when all you really do is BDSM. If you don't think your SO will be totally open to it, try proposing it that way.