It is a scientific fact that many women are not able to orgasm from penetration alone.
We just can't explain why we like certain kinks, and since they are so fun and thrilling to do, we don't care to explain why either.
Much the same happens with watching pornography - as long as you stubbornly watch the same erotic video, you should not expect a level of excitement comparable to that of a teenager.
Put your mind at ease and whip out your throbbing cock to enjoy sex filled flicks that load fast.
That is kind of the point.
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