The most perfect woman has recently waltzed into my life, and I want to brag to her about very private things
Well, I'm not sure this will end well, but what exactly do you want to brag about?
Tell her about my big dick
It is good to be proud of what you have but bragging about your size would be considered as being boastful. And people won't like you.
Nah, I'm going to brag about how good I am in bed by showing her my big dick.
Have you really thought this plan through, because I'm pretty sure you'll only offend her by doing that. You might want to try showing a genuine interest in her personality instead of bragging about the value of your penis. Most women are turned off by that kind of arrogant conversation.