Table 1.

Domains covered under Life Course Theory (LCT) constructs for in-depth qualitative interviews

LCT Constructs	Domains Covered
Timing-when behavior starts	When is oral/anal sex practice initiated? Under what contexts? If bisexual, are these practices different with women? What impacts (impacted) initiation of IAI and/or RAI practice? What role do drugs and alcohol play?
Time- behaviors over time	How does sexual positioning develop over time?
Trajectories-sequence of events behaviors and outcomes	How do goals and values influence decision-making around sex practice? How do life situations (e.g. outness, resource stability, age, partner type) influence decision-making around sexual practices?
Transitions-highlight key life events	What personal events trigger changes in sexual practice?
Critical periods-vulnerabilities that may be heightened	How did (does) independence (or lack thereof) affect sexual decision making?