well, i'm thinking about timing.
with me for example, it takes about twenty minutes to half an hour lying on my back and about five minutes lying on my stomach with or without ~assistance~.
facing any other direction is touch and go (excuse the pun).
what's that about eh?
in your case i think it's pretty common. i've known a few women who can only finish while in the cowgirl or reverse-cowgirl position.
physically, that is one of the deeper dickings, and you're generally in control of it all (momentum, depth).
i think for a lot of people it's also psychological.
that's why i figure it goes a lot faster in my case while i'm lying on my stomach. the almost restraint aspect.
maybe you're just dominant?
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