The purpose of this study is to examine the sexual relationships among heterosexual female college students (ages 18-22) via Qualtrics (a web-based survey). Utilizing latent class analysis with a distal outcome, the proposed cross-sectional study seeks to do the following: Aim 1. Examine the heterogeneity in relationship quality among female college students. Research question 1: Is there a latent class structure that adequately represents the heterogeneity in relationship quality among female undergraduate students participating in penile-vaginal sex? If so, what are the types and their corresponding prevalence? Aim 2. Examine the association between relationship characteristics and latent class membership. Research question 2: Are relationship characteristics (partner type, relationship duration, exclusivity/monogamy, and frequency of sex) predictive of membership in latent classes of relationship quality? Aim 3. Examine the association between latent classes of relationship quality and condom use. Research question 3: Which identified latent class of relationship quality is significantly associated with condom use at last penile-vaginal sex? Please note that the indicators measuring relationship quality will include the following variables: 1) trust, 2) love, 3) passion, 4) commitment, 5) relationship satisfaction, 6) sexual satisfaction, 7) intimacy, and 8) decision-making dominance.