Can oral sex between a 17 & 30 year old get the 30 year old put in jail?

Yes, according to the law in Tennessee, this would be considered "Aggravated Statutory Rape" a Class D felony.

Definitions:
The word cunnilingus, is defined as oral sex and is included in the definition of the term "Sexual Penetration" within the law.

39-13-501. Definitions.

(7) “Sexual penetration” means sexual intercourse, cunnilingus, fellatio, anal intercourse, or any other intrusion, however slight, of any part of a person's body or of any object into the genital or anal openings of the victim's, the defendant's, or any other person's body, but emission of semen is not required;

39-13-506. Statutory rape.

(a) Mitigated statutory rape is the unlawful sexual penetration of a victim by the defendant, or of the defendant by the victim when the victim is at least fifteen (15) but less than eighteen (18) years of age and the defendant is at least four (4) but not more than five (5) years older than the victim.

Statutory rape is the unlawful sexual penetration of a victim by the defendant or of the defendant by the victim when:

(1) The victim is at least thirteen (13) but less than fifteen (15) years of age and the defendant is at least four (4) years older than the victim; or

(2) The victim is at least fifteen (15) but less than eighteen (18) years of age and the defendant is more than five (5) years older than the victim.

(c) Aggravated statutory rape is the unlawful sexual penetration of a victim by the defendant, or of the defendant by the victim when the victim is at least thirteen (13) but less than eighteen (18) years of age and the defendant is at least ten (10) years older than the victim.

(d) (1) Mitigated statutory rape is a Class E felony.

(2) Statutory rape is a Class E felony.

(3) Aggravated statutory rape is a Class D felony.

[Acts 1989, ch. 591, § 1; 1990, ch. 980, § 4; 1994, ch. 719, § 1; 2005, ch. 487, § 4; 2006, ch. 890, § 5.]