Eligibility Criteria:
Inclusion Criteria:
* Willing and able to use OCs or DMPA
* General good health (by volunteer history and investigator assessment) without any clinically significant systemic disease
* Currently having regular menstrual cycles of 25 to 35 days by volunteer report
* History of Pap smears and follow-up consistent with American Congress of Obstetricians and Gynecologists (ACOG) practice bulletin #99 or #109 or willing to undergo a Pap smear at Visit 1
* Willing to follow protocol requirements including abstinence, use of study condoms, and prohibited use of intravaginal products
* Willing to follow post-biopsy restrictions for at least 5 days following genital biopsies
* Meets one of the following criteria:
1. Sexually abstinent and planning to remain abstinent for the duration of the study.
2. In a mutually monogamous relationship for at least the last 4 months with a male partner who is at least 18 years of age, willing to use condoms, and has no known HIV infection or risks for sexually transmitted infections (STIs)
3. In a mutually monogamous same-sex relationship for at least the last 4 months with a partner who is at least 18 years of age and has no known HIV infection or risks for STIs
* Vaginal and cervical anatomy that, in the opinion of the investigator, lends itself to easy genital tract sample collection
* Negative urine pregnancy test
* Willing to give voluntary consent, sign an informed consent form and comply with study procedures, as required by the protocol
Exclusion Criteria:
* History of hysterectomy
* Currently pregnant or within 2 calendar months from the last pregnancy outcome. (Note: If recently pregnant must have had at least 2 spontaneous menses since pregnancy outcome.)
* Use of any hormonal contraceptive method in the last 30 days (oral, transdermal, transvaginal, implant, or hormonal intrauterine contraceptive device)
* Injection of DMPA in the last 6 months
* Protection from pregnancy by presence of a copper IUD
* Currently breastfeeding or having breastfed an infant in the last 2 months, or planning to breastfeed during the course of the study
* History of sensitivity/allergy to any component of the study product, or topical anesthetic, or allergy to both silver nitrate and Monsel's solution
* Diagnosed with or treated for any STI or pelvic inflammatory disease in the last 6 months. (Note: Women with a history of genital herpes or condylomata who have been asymptomatic for at least 6 months may be considered for eligibility.)
* Positive test for Trichomonas vaginalis, Neisseria gonorrhoeae or Chlamydia trachomatis
* Symptomatic vulvovaginal candidiasis, Nugent score greater than or equal to 7 at screening or bacterial vaginosis (BV) at Visit 2, or urinary tract infection (UTI)
* Deep epithelial genital findings such as abrasions, ulcerations, or lacerations, or vesicles suspicious for STIs
* Positive test for HIV
* Positive test for Hepatitis B surface antigen (HBsAg)
* Known bleeding disorder that could lead to prolonged or continuous bleeding with biopsy
* Chronic or acute vulvar or vaginal symptoms (e.g., pain, irritation, or spotting)
* Contraindications to the chosen contraceptive method
* Known current drug or alcohol abuse which could impact study compliance
* Grade 1 or higher laboratory abnormality, per the August 2009 update of the DAIDS Table for Grading the Severity of Adverse Events
* Participation in any other investigational trial (device, drug, or vaginal trial) in the last 30 days or planned participation in any other investigational trial during the study
* History of gynecological procedures (including genital piercing) on the external genitalia, vagina or cervix in the last 14 days
* Abnormal finding on laboratory or physical examination or a social or medical condition which, in the opinion of the investigator, would make participation in the study unsafe or would complicate interpretation of data
* Systemic use in the last two weeks or anticipated use during the study of any of the following: corticosteroids, antibiotics, antifungals, antivirals or antiretrovirals