Probably even more important than the size of your penis is whether or not you are able to get it up when you need it most.
Question 12: Do you have difficulties getting an erection without looking at porn?
A1: No, it takes me about the same amount of time to get it hard. --> 1 Point
A2: No, but it takes me much longer to get it hard. --> 3 Points
A3: Yes, without looking at porn it stays limp as an overcooked noodle. --> 5 Points
For those guys who chose A3: Don't be afraid. I won't bash on you like I did on the last slide ;). Just a friendly advice: The next time you expect to have sex with a woman (whenever that may be :D), have some Viagra at hand. I can say with great certainty that you won't be able to get it up for her.