What the latest science tells us about fidelity, infidelity, memory, the brain's reward systems, love, and sex In both genders and across age groups, infidelity is on the rise. People often cheat in a haze of delusion, believing that it will bring them real love, help them have better sex, lift their spirits, and boost their sagging self-esteem; however, very often, cheating wrecks relationships and erodes self-esteem. Hundreds of people have sought...