This study was a secondary data analysis of a midlife adults' (40 - 69 years) survey. The sample (N = 3,501) was recruited via telephone and completed an American Association for Retired Persons survey via the Internet. This study explored how sexual attitudes and demographic characteristics (e.g., age, gender, prior marital status) were associated with willingness to date heterogeneous partners (e.g., date partners of a different race, religion, with much less money). Results showed that never-married singles, men, and sexually permissive individuals were more willing to date such partners. Implications for research and practice are noted.