How Penny Will Try To Interfere With Leonard's Baby Plans On The Big Bang Theory

Man, Penny is playing dirty. Not only is she pulling out the ridiculously hot undies, but she's also torturing her husband by wearing those undies while reading a comic book. But, as we can see from the above clip, Leonard, being the smart guy that he is, clearly gets wise to her plan at some point and tries to shut it down by sleeping across the hall at Amy and Sheldon's place. So, just how does Penny trying to seduce Leonard interfere with his plans to donate his sperm? Well, putting it as delicately as possible, if Leonard is, shall we say, spent all day and every day because of having sex with Penny, he won't be much good when it comes time to head to the baby factory and make friends with a sterile cup.