Someone else has probably done this before but this is my (canon) version
Hehehehe
…this doesn’t exactly fit with my view of them, but with some stretching I can get it there (phrasing lol)
Yori: fucks because she is a genius hacker who figured out a workaround to fuck despite the MCP’s restrictions on permissions going all the way to kissing
Tron: fucks because Yori’s doing it and Tron doesn’t know exactly what she’s doing but is fully convinced this is just her (very nice) method of giving him directions to the I/O Tower
Clu: doesn’t fuck because he’s never communicated with anyone except Bit and his User, but those User communications are very pleasurable in a dom/sub way. (He knows what sex is because Flynn rambles on talking about all sorts of random stuff while directing him. He knows the thing Flynn talks about isn’t the thing Flynn does with him. But he likes to imagine the feeling is similar. He’s right.)
Ram: doesn’t know what sex is, or think of himself as fucking, for roughly the same reason a fish doesn’t think about water.