Couples who are trying to get pregnant often keep close tabs on the woman's ovulation cycle and time intercourse for the moment when conception is most likely. People in long-distance relationships may plan for sex during visits. Special dates, such as Valentine's Day or a birthday, can guarantee a roll in the hay for some.
On average, adults have sex about 61 times per year, according to the University of Chicago's National Opinion Research Center.
Jackson, who lives in Houston, was pleased with her and her husband's decision to set aside specific times to be intimate.
"Scheduled sex can be a wonderful tool for taking the edge off a drive difference," Jackson said. "The higher drive spouse can have that happy hopeful feeling like you get when you're looking forward to a vacation."
Women do tend to push for "couple time" on the calendar more than men, often because they are the social coordinators in the relationship rather than because of a drive difference.
But Coleman pointed out that setting aside time with their significant other can become increasingly important for men as they age and experience libidinal changes.
And experts say it is important to differentiate between sex that occurs spontaneously and spontaneity and creativity during sex.
"One can schedule time but not demand anything," Coleman said. "You're allowing the time for spontaneity to occur."
Planning ahead can build anticipation for what is to come.
"I've enjoyed hot text messages with my husband," Jackson said. "It can be a nice way to say 'hey, I desire you.'"
But as much as couples may try to compromise and schedule time for each other, having sex when one partner is not in the mood can cause serious problems.
"It's not healthy to have sexual intimacy when you don't want to," Coleman said. "Psychologically it is not erotic to feel pressured. It's not erotic to go through the motions when your mind and heart really isn't there."
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