is it legal for a seventeen year old to have any kind of sexual activity with a fifteen year old?

In the Alabama laws outlined below, a person under the age of 16 is incapable of giving consent to sexual contact under the law. Essentially, this means, that any person under the age of 16 who gives verbal consent to have sexual contact with another person "legally" is incapable of doing so (under the law) and in a court of law the sexual act may be considered as "Non-consensual".

Section 13A-6-60
Definitions.

The following definitions apply in this article:

(1) SEXUAL INTERCOURSE. Such term has its ordinary meaning and occurs upon any penetration, however slight; emission is not required.

(2) DEVIATE SEXUAL INTERCOURSE. Any act of sexual gratification between persons not married to each other involving the sex organs of one person and the mouth or anus of another

Section 13A-6-62
Rape in the second degree.

(a) A person commits the crime of rape in the second degree if:

(1) Being 16 years old or older, he or she engages in sexual intercourse with a member of the opposite sex less than 16 and more than 12 years old; provided, however, the actor is at least two years older than the member of the opposite sex.

(2) He or she engages in sexual intercourse with a member of the opposite sex who is incapable of consent by reason of being mentally defective.

(b) Rape in the second degree is a Class B felony.

(Acts 1977, No. 607, p. 812, §2311; Acts 1979, No. 79-471, p. 862, §1; Acts 1987, No. 87-607, p. 1056, §2; Act 2000-726, p. 1557, §1.)

Section 13A-6-64
Sodomy in the second degree.

(a) A person commits the crime of sodomy in the second degree if:

(1) He, being 16 years old or older, engages in deviate sexual intercourse with another person less than 16 and more than 12 years old.

(2) He engages in deviate sexual intercourse with a person who is incapable of consent by reason of being mentally defective.

(b) Sodomy in the second degree is a Class B felony.

(Acts 1977, No. 607, p. 812, §2316; Acts 1979, No. 79-471, p. 862, §1; Acts 1987, No. 87-607, p. 1056, §3.)

Section 13A-6-70
Lack of consent.

(a) Whether or not specifically stated, it is an element of every offense defined in this article, with the exception of subdivision (a)(3) of Section 13A-6-65, (see below) that the sexual act was committed without consent of the victim.

(b) Lack of consent results from:

(1) Forcible compulsion; or

(2) Incapacity to consent; or

(3) If the offense charged is sexual abuse, any circumstances, in addition to forcible compulsion or incapacity to consent, in which the victim does not expressly or impliedly acquiesce in the actor's conduct.

(c) A person is deemed incapable of consent if he is:

(1) Less than 16 years old; or

(2) Mentally defective; or

(3) Mentally incapacitated; or

(4) Physically helpless.

(Acts 1977, No. 607, p. 812, §2330.)

Section 13A-6-65
Sexual misconduct.

(a) A person commits the crime of sexual misconduct if:

(1) Being a male, he engages in sexual intercourse with a female without her consent, under circumstances other than those covered by Sections 13A-6-61 and 13A-6-62; or with her consent where consent was obtained by the use of any fraud or artifice; or

(2) Being a female, she engages in sexual intercourse with a male without his consent; or

(3) He or she engages in deviate sexual intercourse with another person under circumstances other than those covered by Sections 13A-6-63 and 13A-6-64. Consent is no defense to a prosecution under this subdivision.

(b) Sexual misconduct is a Class A misdemeanor.

(Acts 1977, No. 607, p. 812, §2318.)