Thus, we do not know if participants were only referencing vaginal intercourse here, or if they were counting other sexual activities. (lehmiller.com)
Government - sponsored pornography is unable to interest heterosexuals in vaginal intercourse. (firstthings.com)
If you are not using hormonal birth control, we recommend you abstain from vaginal intercourse for 14 days prior to your appointment. (plannedparenthood.org)