The Collidge Effect: Is the point where a guy no longer feels the thrill from Sex with his Girlfriend/Wife. and in order to feel the Thrill he needs constant novelty (New Girlfriends/Wives to have Sex with in order to re-feel the Thrill from Sex again that he felt the first time.). The collidge effect is Real, and after some months with my girlfriend I feel like the Orgasm is shit. and I don't feel any pleasure The thrill can only be achieved from a new girlfriend. I'm about to break up with my Girlfriend because of the Collidge Effect, but I'm afraid to regret it because She truly loves me, and she gave me her heart. But the collidge effect is so powerful, I can't feel anything with her anymore, No pleasure, nothing. I'm feeling like if I was 80years old when I'm with her Only the collidge effect makes me feel young again. even though i'm still in my twenties.