My freshman year, some guy, maybe the EQP? rode the elevator up to my floor of the women's dorms during non-visiting hours to ask a question of one of my neighbors. He didn't step foot off of the elevator, just asked the first woman who passed to go get her (cell phones were less common, then). At the time, I was outraged that he had put me in a position where I had signed a thing saying I would rat people out for breaking rules, but I really didn't want to be a rat. Now, I'm outraged that the school would put me in that position, where to keep my word, I would have had to put people's educations in danger for a comically chaste interaction.
Hanging out with members of the opposite sex after hours was the instance that came up the most during my time in Provo. While I was a student, I generally stuck to the letter of the law, and if I was out late with male friends, we mostly wandered around campus or chatted on porches, etc. It was often the subject of joking scolding among my friends, though one of the most caustic roommate fights I was ever unfortunate enough to be forced to overhear was where one was demanding that the other leave her boyfriend's house (where they had just been talking, nothing sexual was going on). After I graduated from BYU (but was still in near-BYU housing), I thought it was idiotic that I was still supposed to follow the Honor Code, just because I lived in places that BYU students might also choose to live. At that point, I did some back-and-forth visits after visiting hours with a (mostly-, since I'm generally a rule-follower) clear conscience.
I dated a guy who didn't go to BYU, but whose family predicated their financial support on him being clean-shaven anyway, because they saw the Honor Code as a higher law than even the temple recommend questions, which I think is absolute baloney. They also tried to get me to convince him that beards were gross, when my father has had one for most of my life, and I actually quite like them on men, due largely to my time dating their son. It didn't go well for them. (His eventual solution was to drop out of college, because he wanted to grow a beard (and he should have: it looks great on him!) but didn't want to lie to his family, and because he was already in a well-paying job without a degree, so finishing college didn't feel urgent or necessary).
I like the idea of students being honest in their academics and other dealings, and using common sense in their interactions with others, but I think the culture it promotes is downright dangerous (since serial predators can, and frequently do, manipulate their victims by pushing them to break small rules, and then push them far past that point, and know the victims are unlikely to report them because it will hurt the victim's reputation, education, and church standing to do so, and the predators generally get off without any punishment at all). Plus, a lot of the rules (well, the ones I remember) are outdated and stupid -- like beards still being forbidden because the church wanted to distance itself from hippies back in the 60s, and being barefoot in public is banned because ... I don't know. Because people find it gross, I guess, which I get, but that's no reason that someone's degree should be in jeopardy.