You mentioned this "girls only" crap.

If girls reply thinking it's big, then wow, that could boost your ego.

If girls reply thinking it's small, then wow, that could decrease your self-esteem.

If you are the above case with the examples, you probably shouldn't even be asking.

Instead, find the statistical average. If you know the penis length on the 50th percentle, an ideal question to ask girls is if they think that's big enough.

Neal C.