While a dating partner may not welcome this news, it at least can minimize later disappointments.

According to the singles whom Allen has encountered, boomers generally play by far different dating rules than young, 20-something daters.

"I spoke with a young man in his early to mid-20s who told me that if he didn't have sex on the first or second night, he'd move on to the next person," she recalls.

If both people are playing by the same dating rules, sex can serve as the gateway to a consensual, committed relationship.

"I thought there were differences between men and women and how they felt about relationships.

Once you've decided what you want out of a date, say experts, you should make it part of your regular dating rules to tell your partner.

"If you just want a one-night stand, you owe it to your partner to tell them 'it's just sex I'm after,'" Mc Clary tells Web MD.She also says the conversation, like the primping, should happen at the same time -- before that big date."Think about your sexual boundaries before you've had that first drink," Mc Clary advises.Concern about STDs and unwanted pregnancies can help create sexual boundaries, believes Mc Clary.If, for instance, you're on the fence about whether or not to take sexual activity to the next level, a healthy dose of fear may cause you to pause, particularly if you're not prepared to take the necessary precautions.But overall, I have found that very often they want the same thing," Allen says.