Can you be a virgin and be an expert at sex?
No. You may have read a lot about it. But you can't be an expert unless you've experienced it.
A virgin means that you never have had sex. If you are NOT a virgin, then that means that you have had sex. "Sex" includes what goes "in" or "in" (oral or vaginal), but the word virgin applies specifically to a person who has not had intercourse. But, oral sex and vaginal sex carry the same risks of STDs.
A virgin is someone who has never participated in sexual intercourse. Once someone has had sex, they lose their virginity and are no longer a virgin. Virginity, when lost, can not be reclaimed. Virgin means someone who has not had sex - you do not become a virgin, you are born a virgin and continue to be a virgin until you have sex.
All that "virgin" means is you have not been penetrated by a penis. However, guys especially need to get this-- a female's hymen is NOT, NOT, NOT a sign of whether a girl is a virgin or not! The hymen can tear for any number of reasons, not just from having sex. Most girls do NOT have an "intact hymen" before their first sexual experience.
No, using a tampon does not mean that you're not a virgin. A virgin is someone who has not had sex - you remain a virgin up until you have sex with another person: how you define sex and virginity past that is up to you. A tampon has no impact on whether or not you're a virgin, this is because a tampon is not another person and inserting a tampon is not sex.
If you haven't had sex (penis in vagina), you are a virgin. If you have had sex, you are not a virgin. PERIOD. There isn't really anything to check. Sometimes your hymen will break when you first have sex, but sometimes it does for other reasons (exercise, etc...). This is NOT the determining factor.