I love that he included his penis size at all. As if a woman would say, "Oh finally, a man who is letting me know the important details I really care about."
And that's something like the 99.99999th percentile according to the chart on the Wikipedia penis size page - absolutely NSFW - which has nothing larger than 18 cm.
The apparently much less studied vaginal depth seems to max out at 14 cm before arousal, so I think it's safe to say most women wouldn't be impressed by that number even if it weren't an obvious lie.
This is one place where the metric system really shines. If I say I'm 6.5", it sounds like I'm desperate for that last half inch. If I say I'm 17cm, that's just what it is.