Generally speaking fairies have very different ideas about some things then humans do, mostly because fairies have very different and often incompatible sets of ideals for how people are supposed to act compared to normal human ones. Humans that become fairies are mostly either already preconditioned to reject normal human ideals anyway, end up slowly accepting fairy ideals, or end up isolating themselves from other fairies.
One of the big differences relates to sexuality and gender. Most fairies do not really have a strong interest in ideas about gender, both in sense of identity or orientation. Of those that do identify as a particular gender, most think of themselves as female. Their is a real advantage to fairies in the female form because of the utility of being able to lay their own eggs, and so many fairies stay in a female-ish state most of the time. Fairies that prefer a male-ish state are not exceptionally rare, but still not as common. Many even prefer a state that mixes genders.
To a fairy, a person is a person, for the most part. Sure, a number of fairies are more or less attracted to, or more or less inclined to identify as, a particular gender, but most don't end up thinking in quite that way. Because many fairies can alter their bodies and become whatever they feel like at any given moment, gender is more a kind of fashion. That is to say, a fairy will often treat gender as a human treats the type of clothing someone wares, as a sort of statement about who a person is sure, but not a defining part of it.
Another big thing that is different is the fairy idea of romance. Romance is for fairies purely defined by how much someone in a relationship actually feels something special for another. Anything could be romantic, and it tends to be that to a fairy almost all of their interpersonal relationships are thought of as in some way romantic. Other times fairies can attach very little importance to any interpersonal relationships at all.
The most basic relationship that is often thought by fairies as romantic is friendship. Fairies don't always have tons of very close friends, but many of them can be very friendly. Fairies are naturally polyamorous and there is not often a lot of distinction between 'friend' and 'lover'. Even casual friends can often do things that to humans may seem shocking, such as going out as a couple, kissing, and engaging in sexual activity. Even so, many fairy friendships do not and lots of fairies do only do that kind of thing as part of a deeper relationship, either deep and lasting friendships or something a little bit more.
Fairies value honestly and mutual openness about each other's romantic expectations when it comes to friendship. Being dishonest or hiding activities with others tends to strain or break friendships. Sometimes fairies can take friendships very seriously and when friendships break it can get messy. Other times fairies don't take it nearly as bad and will simply move on without much fuss. It's not always easy to see how a fairy will react to such a break up.
Beyond friendship, fairies do have a loose sense of 'family' as such. Since fairies do not have normal offspring, they don't tend to have the same concept of 'family' as humans do. Often fairies will have those that they refer to in similar ways, such as thinking of another as a sibling, child, or parent. Sometimes this is just a way to show deep friendship or respect, but it can go far beyond that.
Often fairies who want to be bonded as 'family' will preform particular magical rituals. These rituals can be involved, are often sexual, and tend to alter the fairies who participate in subtle ways to become more alike. A 'family' formed this way is often called a 'brood'. Fairies of course have no incest taboo whatsoever, and in fact being bonded in this way is often motivated by becoming closer both in body and soul with another. A brood could have many members, but usually it is most stable for around three to five members to live together per steading.
It's possible to undergo another ritual to become part of a new brood, but most fairies tend to think becoming part of one overwrites any others. Without such a ritual, it's still possible for fairies to form what is often called a 'kinship'. Kinships are much more informal and such relationships can be formed and broken on the fly. A kind of mutual adoptive sibling kinship can sometimes be thought of almost as a kind of marriage (which outside of the higher social levels of the Seelie court is not a tradition fairies often practice), and the adoption of a child by a parent can have it's own social implications.
Often fairies, especially the Unseelie court, will also play games of domination and submission and a common relationship is that of the master/mistress and their playthings. This is an especially attractive option for those fairies who are too jealous and controlling or otherwise selfish to deal well with other kind of relationships. In such a relationship, the plaything is totally at the mercy of the master/mistress and will have to obey or else just be used to sate any desire the master/mistress has. Despite this, it is still often very romantic and a good number of them are mutually loving and caring relationships. They are also not always sexual.
The Unseelie court engange in this as part of their game too. An Unseelie may capture another to make into a plaything, but failing to make an Unseelie your plaything usually means the fairy ends up one themselves and the Unseelie gains all the playthings that fairy had collected. Seelie on the other hand only allow this sort of thing with permission and attempting to force a solitary fairy is likely to get the offender banished. Sometimes though selfish fairies will attempt to capture humans who are sometimes seen as fair game. But I would never to do that to you! Honest!
Aren't you glad you learned about fairy culture?