It wasn't the biggest bulge I have seen, but it was the most tempting. I was talking to a hunky cop, and I noticed that there was a distinct bulge at the top of one leg of his trousers. Not the untidy sort that you get when a guy is not wearing underpants, or is wearing boxers, but the rounded, firm looking sort that you get when a guy has a big package held in by briefs or trunks, and it is forced down the leg of his trousers. The temptation to reach down and feel how firm it was was only just resistible.
On another occasion, when our cops still wore white shirts, there was one crouching down speaking to a driver through the car window, Through the white material of his shirt, I could see the waistband of the cop's black underpants. I wanted to run my finger along it.