Knees or back?
For me it depends on my mood and who I am with. Sometimes I love being fucked hard as my ass is slapped and hair pulled and feeling my nipples grazing across the sheets as I am being fucked doggystyle.
Other times I get really turned on being on my back with legs up in he air taking the big cock deep in my pussy.
Of course both positions are submissive and have given intense orgasms so it would be a tie between these two.
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