Are lovers more closer than husbands?

Hi, I'm a married mom (38 years old), my friend (also married mom in the same age) fall in the infidelity with a guy... She did with him what she never ever did and can't do with her husband... I don't want to talk about those dirty acts she did, but I told my cousin about her and she told my that she also know a woman did the same thing (she gave her lover more and more than she can gave to her husband)... Some people say: "Women always are more sexual with their lovers then their husbands"... Is that true?