Sexual tension is paramount in any interaction with a woman.
It is the energy, or charge of the interaction. Its application is subtle, but powerful.
There are many different conceptualizations of sexual tension floating around in the seduction community.
Some examples of these are cocky bantering and flirting, explicit sexual interest paired with false barriers, using the word sexy to convey a sexual intent, and of course the old Speed Seduction route complex language patterns intended to implant sexual thoughts in a womans mind.
Some of these techniques are better than others, and can definitely improve the quality and success of your pickups. I prefer a very pure definition of sexual tension because it is grounded in real sexual desire, and a very natural way of magnifying the tension felt by the woman.
Sexual tension is the presence of a controlled arousal state, in the absence of overt sexual interest.
When the time is right, I create sexual tension by focusing my sexual desire on my woman, but not making any overt sexual advances. I maintain intrigue, a sense of ambiguity, which keeps her focused on me, and directs her mind...