No condom with these young sluts who you are fucking? It's just a matter of time before one infects and you infect your wife with an STD. Not to mention knocking up one or more of them. Aside from those risks, good for you! Keep having fun, but make it safe for everyone.
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OP here. These sluts are not quite sluts. My current gf is 24, a kindergarten teacher and we've been together since she was 20. She knows exactly my situation and I've had her in my bed, in my shower, on my couch and in my wife's car. No condoms required, she's on birth control.
Before that I've had 3 other girlfriends. It's better when they aren't random because you can get to the point where I bareback her in the ass on my living room floor while my wife is at work.