To that end, Mc Clary often tells women, "If you value a committed relationship, ask yourself, 'What do I need to do to stay emotionally whole?

"Make sure your brain, heart, and penis are in conjunction -- they should all be in a straight line before you have sex," she says.

Mc Clary believes all daters should invest the same amount of time conducting these 'self' conversations about personal dating rules as they do primping before a big date.

But overall, I have found that very often they want the same thing," Allen says.

Don't waste your time dating when you can cut straight to the chase. Jessica Hall One of our favorite models returns for another incredible lingerie shoot, including some great photos with a red, heart-shaped guitar.

Plus, not having adequately prepared for these practical aspects of sex may signal an overall non-readiness to engage in it.

At some point during their courtship, many dating couples decide its time to break down initial boundaries -- be they emotional, physical, or both -- and engage in a sexual relationship.

"The risks of STDS have got to be discussed and prevented from spreading," Allen tells Web MD.

"I say definitely use condoms, even if you're in a committed relationship," she adds.

Ali Sonoma The beautiful Ali Sonoma returns to show off her killer body and beautiful face in sunny Miami Beach.

Check out the great photos of this blonde beauty taken from a condo overlooking the water and the city.

"My advice is this: wait as long as you can," Allen says.