Sex and the City, Season 2

Samantha:
Men cheat for the same reason that dogs lick their balls: Because they can. It's part of their biology. Instead of wasting all this energy condemning it, maybe it's time we all got in line with the reality of the situation.

Carrie:
Well, that sounds very empowering, but you're forgetting one important detail.

Miranda:
God, I hope so.

Carrie:
Women cheat.

Charlotte:
Yeah, but it's completely different.

Samantha:
How?

Charlotte:
'Cause we don't go around randomly attacking any man that we're attracted to.

Samantha:
Speak for yourself.

Charlotte:
We're not driven by testosterone.

Carrie:
Then what does drive us according to you?

Charlotte:
Emotions.

Samantha:
You mean hormones.

Charlotte:
No. I mean that little voice inside of me that says, "Mate for life! Mate for life!"

Samantha:
Sweetheart, you can't go listening to every fucking little voice that runs through your head. It'll drive you nuts.