Yeah, really. The fact that this thread is your first and you're asking this particular question makes you seem really suspicious. Generally, people who apply for membership get denied, or deleted, for one of four reasons:

1. They're underage and state, either in the age field or in the date of birth field, that they aren't older than 18
2. Their IP address they're applying for membership with belongs to an already-banned member, which indicates they're a poser trying to sneak in under a new identity.
3. They apply with an inappropriate screen name or email address or they fill in some other field with a joking or inappropriate answer
4. They don't correctly ensure that their stated chronological age matches their stated birthdate. These are two separate fields, and we always know someone's not telling the truth when they say, for instance, their birthdate was in 1970 but then, a screen or so later, fill in their stated age as 22. We see the entire membership info form on one screen, and when those two fields don't match up, they're denied.