Well, to some extent it does actually, to some extent it definitely doesn't.

Married people who see other people do so because of their sexual needs, not because they do not really love someone. Sure, if you really love someone you'd expect the person to live with it and accept the fact that their sexual relationship is bad or perhaps even none-existent for whatever reason, but it doesn't work that way. Perhaps it's just our animal side, but it definitely matters,

Cheers