In most social situations, I do not normally brag about the large size of my penis even in situations that would allow some good-natured bragging probably because of an appropriate concern for good manners and perhaps also because of my natural tendency to maintain somewhat of a polite reserve. Sometimes, though, others will bring it up. If so, I am usually willing, and even pleased, to converse about it in either a playful or serious manner, although I am mindful about not coming across as being too impressed with myself. Although I dont typically boast using words, I must admit that, in terms of behavior and clothing (or the lack of clothing!), I do like showing it off when circumstances allow it, which I suppose is a type of bragging. In sexual situations, sure, I will verbally brag if the other guy likes for me to, which often guys do.
Certainly, as pointed out by Doyouwantit in his post, part of the appeal of this site for me and other well-hung men is that it provides an open and easy venue for us to proudly and freely exhibit and talk about our big dicks to an interested and receptive community. Here at LPSG, there is no need for pretenses of modesty or for other some of the other social graces we routinely employ elsewhere. This is one of the big reasons why LPSG is a fun group.