Anything to make money. It'd be a bit different if he was only making a few hundred bucks a month, then the penis links may seem overkill then, but he's basically hitting 5 digits a month now (8.5k last month) and the more he makes, the more popular his blog will be because that attracts people.
Look at problogger. How many of you guys think Darren posts quality, meaningful stuff there? IMHO his popularity grew because of the snowball effect of it's popularity from monetizing it and making good money from it.