When it happens it happens, no need to rush, and if I feel ready and if I have circumstances which suit me at that time, why not? If I'm a forty-year-old virgin, so be it.
And for the whole "Only having one sexual partner" thing, It'd help to prevent STI's, but
I wouldn't care either way, what happens, happens. Honestly, Sex is most commonly done for pleasure, or for symbolizing love, really, there are other alternatives which aren't overused to express love and to have fun, Sex is really an act of procreation.