DW will sometimes need to 'wipe' herself during, because she gets so wet, the friction is decreased to where she won't be able to cum unless she wipes off some of her lubrication.
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Women who have had repeated birth trauma that was not repaired can develop "gaping" vaginas that don't provide much traction for the penis, but having the woman's legs in the center can usually overcome this. The most common problem is that the man is more tired of the woman than her vagina. A good obstetric attendant can usually prevent, or repair this trauma.