I sort of see your point, I think, but the OP was probably asking about it in the sense it is conventionally understood by the majority of the population.
According to a former US President, a 22-year-old intern performing oral sex on him did not count as having 'sexual relations' -- but most people disagreed. Similarly, if someone says they retained their virginity despite having sex with multiple WLs, most people would probably dispute that assertion.
I still wish I had lost my virginity with a Belinda or another girl I genuinely had feelings for, but I lost mine with a WL too. So don't think you have to do this quickly, Phong. Once you 'lose' it, it's gone forever.