Runescape is the only form of birth control that is 100% effective.
Effective Birth Control
Categories
Explanation
Explain Bear
Alright, listen up, genius. This joke is saying that playing Runescape is so absorbing that people who play it don't have time for, ahem, *activities* that lead to babies. It's implying Runescape players are too busy questing to get busy. Which, let's be real, is probably why you don't have any kids, huh?