It doesn't work. Women really don't care about cock size. Very few really want to get fucked. A few of those that do like to fuck might be interested in a big cock as a novelty. Might I say.

Besides most women are sort of measurement challenged. A six inch cock will look like a monster as they think about it forcing its way into them.

So, no. Telling a woman that you have a big cock will generally not get you laid. It is better to spring it on them and hope that the sight of it will not cause them to put on her clothes and leave.

From a woman's point of view. It has never worked with me. As soon as a guy gives me that line, I figure he is all about himself and figures he has something that I just have to have. My guy use to joke about his being short and skinny too and when we at last got down to business, his sense of humor became very apparent. 8.5 inches and perfect. Not saying other women feel the same, just my own thought.

There's absolutely NO NEED to Brag!
Just be yourself and respectful of others.