For a pure person, it's not about finding a boyfriend, it's about finding the one boyfriend. For them it's a relief to not have to worry about it until they actually have one.
I've myself retroactively become pure.. sorta, in the last few years. It has nothing to do with wanting to become an innocent pure japanese girl.
I had 4-5 girlfriends in the 2004-2010 period and after a particularly bad breakup(with my fiancee) I felt I didn't want to bother with going through a relationship again unless I could convince myself that she was the one. I've conditioned myself to be free of desires and instead spend my time being productive with whatever I'm doing. I'm putting my effort toward doing what ever projects I've got going and for me it's a pretty sweet deal since I don't lose any time hassling with gfs or wasting quality time with someone I eventually will break up with.
The time for that will come when I find the right one and at that point I'll release my libido without any regrets. Abstaining from sex is easy when you have porn and something productive that will improve your life to occupy yourself with, I don't find it hard to believe that a person can have this mindset from the get go and simply not really care about these things until they are actually happening.