Virginity doesn't have any intrinsic value (and you should be seriously suspicious of anyone fetishizing your sexual status), but the decision to keep it or not is the most important thing in the world. Because when it comes to someone's sexual activity, their decision is the only thing in the world.
The same sticky brush of implied sexual superiority is often used against asexuals, "aces," people who lack attraction to or interest in all the sexual squickiness. Some guys (and, yes, it's usually guys) take this as a personal offense. Their sexual egos are so fragile that someone else never getting laid is personally disturbing. Probably because it strikes too close to home. But if you've ever refused to believe that someone is ace, don't worry; they don't believe anyone else would want to have sex with you either.
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"But biologically speaking ..."
And if you wouldn't ask your boning friends about their favorite sexual position, don't ask your virgin friends why they don't have one. Maybe they haven't met the right person. Maybe they're recovering from abuse. Maybe they're waiting for the Third Conjunction that their genitals might raise an Elder God to feast on all flesh. In any event, if they want you involved, they'll let you know, but until then don't user their crotch for light conversation.