BuzzFeed also spoke to Dr. Rodriguez, who said there’s been several studies on this topic — and most of them are surveys from heterosexual men and woman. “In a study done in 2005 (which looked at penile-vaginal intercourse), 500 couples were asked to press a stopwatch from penetration until ejaculation, and the results led to an average time of 5.4 minutes. Another study, where sex therapists were asked how long penetrative, vaginal sex should last, most agreed that the ‘adequate’ or ‘desirable’ length was 7–13 minutes — and that 10–30 minutes was too long! Finally, a study done in 2020 asked heterosexual women how long it took them to orgasm, and they found the average time was 13.4 minutes.”
NOTE: It’s also important to keep in mind that every person and every couple defines sex differently. For example, when thinking of how long sex lasts, some may include foreplay and some may consider it to be when both parties climax.