The American Heritage Dictionary defines "sexual intercourse" as:
noun:
1. Coitus between humans.
2. Sexual union between humans involving genital contact other than vaginal penetration by the penis.
In case you don't know what coitus means, here's the definition of that:
Sexual union between a male and a female involving insertion of the penis into the vagina.
If you look at the second definition of "sexual intercourse" you will see that it's a sexual union involving genitals. Any genitals. Not just a penis and vagina.
Therefore If you follow the American Heritage definition of virginity, it seems any sexual union where you make contact with each other's genitals counts as losing your virginity.
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