Plus, even if no one was having sex during the entire trilogy, when it comes to Han or any character that isn't Luke, we can assume that they did some celebratory plowing after the events of Return of the Jedi or, at the very least, we can refrain from speculating wildly about their possibly lifelong virgin status. But it's different with Luke.
Why Can We Assume Chewbacca had Sex but Not Luke?
For one thing, Chewie's a stone-cold pimp, he's like a deep-dicking carpet. For another, Chewie doesn't have to answer to the Jedi Code, (or, indeed, anyone). Jedi Knights, on the other hand, are Warrior Monks. Their clothes are simple, their homes are just basic shelters, they generally shun material possessions and, according to Wookiepedia, live under an overall "philosophy of non-attachment." It was believed, in fact, that attachments "lead to the emotions of the dark side." Officially, marriage was outlawed and it is reasonable to presume that sex was as well; sex can lead to attachment, or overpower judgment, or distract you, or lead to any other number of awesome things that the Jedi Council looks down on. The life of a Jedi is a life of celibate isolation, which is why Anakin and Padme had to hide and lie about their marriage in Star Wars: Episode Whichever Shitty New Star Wars Movie They Got Secretly Married In.