context: The researchers made conflicting discoveries about how long to wait for ejaculation in the vagina. In a multinational study, [1] 491 men were studying in the Netherlands, Spain, Turkey, the United Kingdom, and the United States. The men had stable sexual relations. Over a four-week period, couples recorded waiting period ejaculation within the vagina using a stopwatch and indicated the use of a condom. There was no relationship between the mean waiting period for ejaculation within the vagina and the use of condoms. The average waiting period for ejaculation within the vagina decreased with ages (from 18 to 30: 6.5 minutes, and from 31 to 50: 5.4 minutes, and 51+: 4.3 minutes). For all participants, the average waiting period for ejaculation within the vagina was 5.4 minutes. The average waiting period for ejaculation within the vagina varied significantly by individuals, with 14% of men under 3:20 and 26% of men above 10:00. Possible problems include the total sample size, the small sample size for each country, the lack of observations for each participant, and the psychological effects of using the stopwatch.
question: What is the normal rate of sexual intercourse?
answers.text: 5.4 minutes