Okay, the above statement might be a bit of an over-simplification. The first part of the equation is a risky and untested branch known as psycholinguistics. Writers, particularly people who write speeches and other works of that sort, have to be aware that certain words have certain effects in certain cultures. To use those words in the right context, tone, and time can sometimes be critical in getting one's point or message across.
The relationship between psycholinguistics, a prospective partner's view of your sexual health and attractiveness, and seduction is rather simple. In theory, by using the right words to trigger the right subconscious switches in a man or woman's brain, you can supposedly make them more susceptible to your ideas. Basically, this is just science meddling in the age-old adage “tell them what they want to hear,” except with a lot more jargon to make it seem like a modern concept.
Another aspect that psychology can be used in the seduction game is through the use of emotions and the psychoactive effects they possess. Certain emotions produce certain chemicals in the mind, often in highly specific quantities. These compounds have effects on the brain that affect more than just a person's emotional stability and mood. Most people have something that can be described as their “favorite emotion.” This is rarely a matter of conscious preference, despite the fact that the brain reacts quite favorably towards people or things that are perceived as sources of that emotion.
In theory, being able to make the target's brain experience intense levels of that emotion is a sure-fire way to get someone – anyone, some say – to fall in love with you. The difficulty here, however, is just how to determine what the “favorite emotion” is. As previously stated, the relationship between external appearances and the “favorite” can often be difficult to pinpoint. The brain might favor the emotional mix internally, but the person's conscious personality could avoid it like the plague.
But of course, having the tricks on psycho-linguistics up you sleeve does not guarantee that a man's relationship with a woman would be a match made in heaven.