Consensual sexual activity of any kind with another person counts in my opinion, it's not limited to PIV anymore...
I'd agree with this. Considering just how many kinds of sex one can have, I'd say so long as another person is involved you might as well count it. Though I also agree with Petite Valentine that some kind of physical contact would be what seals it.
I see virginity in two seperate ways: status as a captital-V "Virgin" and the progressive loss of levels of virginity with different activities.
My concept of a Virgin is someone who has never had sex with a partner. Sex with yourself does not count. Therefore, when someone has sex for the first time with the participation of someone else, whether it is oral, intercourse, mutual masturbation, whatever - that person is no longer a captital-V Virgin.
But after that, you can still loose your lowercase-v virginity with different activites that they've never done before. Anal virginity, oral virginity, strapping-on virginity, etc. You may have had sex, but you can still lose your lowercase-v virginity trying something new.
So yes, someone who has strapped it on with a partner is no longer a Virgin. But they can still have virginity to lose in other ways.
Sex is sex, so yes. Whether it be oral, VIP, with a toy, anal, whatever. If by definition losing virginity is being penetrated then there are a lot of sexually active lesbians out there who have engaged in oral sex or fingering and do not like penetration that are virgins.
A person who penetrated by their partner with a strapon dildo is "a person who ha benn penetrated by their partner with a strapon dildo". I gain nothing by labeling it further. Indeed I loss data and perspective sexual experience is a continuum not done justice by simple dichotomies.
I think you get to decide for yourself when you feel like you've lost your virginity. I had strap-on sex at 16, but it didn't involve an emotional connection and it didn't feel good, not to mention I'd already broken my hymen via masturbation, so I didn't feel like anything momentous had happened. It was a kind of virginity loss but it didn't feel complete.
Strap-on sex can be a totally valid way to lose one's virginity, though. It's up to you to define what counts as sex for you.