The No. 1 face template has rather large lips, so that's why the "green glasses guy" has them, even as a male.

The female versions of male lips are always way bigger than the male versions, so even males with small lips can pass on large lips.

It's a little annoying to me that making a male sim with large lips equals extremely large lips in any female offspring. There should be a difference, but probably not that much.

Nope, not Buck... keep guessing. ;)