TIFU by recommending porn to a classmate

So some background before I start, I'm a woman who is not the best at social cues. It's gotten better with age but it's been a learning curve. I have definitely improved since this happened. Also, I'm not a native English speaker so pardon any mistakes.

This happened a long time ago when I was in university. I had recently moved and started my program, but was at the time visiting my sister in my home city. 

It was in the evening and when my phone rang. It was from a guy in my class, we didn't know each other well but he always seemed calm, introverted and shy, but not in an uncomfortable way. I knew his mum died earlier that year and I felt bad about it so I always tried to be nice with him.

So I answer the phone, he says who he is and I wait for him to explain why he was calling. So, after some mumbling he asks "I'm trying to find some porn, do you have any recommendations?" (Or something close to that - it was a long time ago). I obviously thought this was strange, but it didn't cross my mind that it was a prank call. I had worked at a call centre during summer jobs and had experienced weird phone calls before, and obviously had met some men with inappropriate behaviour during my lifetime. So I thought "maybe he is drunk and this is some form of breakdown after his mum's death" or "maybe he's weirder than I thought". 

I had a reputation in class of being the one who knew too much about weird sex things that pop up on the Internet. I don't actually watch porn myself but I was familiar with porn parodies, rule 34, Hentai and weird kinks.So I thought maybe this was his reason for calling me, even if it was unusual (to say the least) to ask an essentially unknown female classmate over the phone for porn recommendations. In general, my classmates were a little more prudish than I was used to outside of university, but the male classmates less so than the female students. 

I had just heard about the Pirates of the Carribian XXX porn parody and that it was supposedly the most expensive porn parody ever made (at the time). So I went for that (why I even went ahead and gave him a recommendation I don't know! I should have just said no but for some bizarre reason I took the question seriously and went for it). I claimed to not having watched the porn parody (true) but I don't think I would have believed that if the roles had been reversed. 

The conversation continued awkwardly, and eventually he stopped and revealed it was a prank call. Some other male classmates were with him, they had been drinking and apparently prank calling several girls in my class. I'm pretty sure none of the other girls fell for it or actually gave any recommendations, serious or not. I awkwardly laughed and then hung up. My sister appeared next to me and said "WTF, how on earth did you not realise it was a prank call!" (she heard everything). Both my sisters make fun of me for being socially awkward, so on top of being embarrassed for having fallen for the prank call and actually given a porn recommendation (and for having to face my classmates later), I was also embarrassed for being a socially stunted idiot in front of family. 

Later in the week one of the guys came up to me and said "It was great that you played along, very funny!". I'm pretty sure they realised that I fell for it and were just trying to be nice, pretending that I was in on the joke and just pranked them back. 

This still makes me cringe all these years later. I'm pretty sure I had some reputation after this, as the class idiot or the class pervert. 

As far as tifu:s go, it's perhaps not that spectacular, but maybe it'll make some other socially inept feel a little better. 

TL;DR fell for a prank call, gave porn recommendations to an essentially unknown male classmate.