Certainly could be real. I myself often have a large bulge due to large, heavy balls; an above average cock (not even one of these monsters that some other guys on here have); and tight pants. About 20 years ago, I worked every day with a young guy who wore tight jeans and I used to joke that he kept a grapefruit in his pants. Never saw his cock, but I have seen the cocks of a few other guys whose limp 6-8" made plenty of bulge all the time. Skepticism is OK but don't simply dismiss big bulges as being fake.