With the abbreviations on here DF for fiancé can be confused with father; DB for boyfriend can be confused with brother and BF for boyfriend can be confused with best friend (or breast feeding!) so DP is the clearest and most obvious default for anyone in a reasonably serious relationship who is over the age of 13
Good point.
I don't know why people get so worked up about this, it does seem to be an issue for some of those who are married though [smug marrieds] as though 'married' is some kind of protected characteristic that needs defending from pesky interlopers.
I had a boyfriend when I was 17, now I'm nearing 40 and in a long standing and exclusive relationship, I have a partner and no, we don't live together. He is much more than a shagpiece though.
IMO misogyny is at the root of this mindset, that only women who are 'worthy' of marriage have any status. Anyone else is 'just' this, or 'only' that. That being married makes you 'respectable', which, is of course, bollocks.
Being married and the so called status that goes with it, is just not important to everyone. It is very much possible to be in a stable and happy relationship, without a marriage certificate or a shared mortgage/tenancy agreement.
People should worry less about what others do really.