ISTPs with well aware (rehearsed/practiced) Se from what I have noticed, communicate with their physiques.
It is somewhat described in this link.
What I have quoted describes how they approach danger but the same could be used to described how they approach females. The opponent in this instance is the female. She is not an opponent but a person of interest that has to be won over. And how does the ISTP do this? They do it with their calm and cool body language. What they communicate is confidence, maleness, boldness etc which ticks the subconscious of the female and gives her mixed signals of both danger, seduction (seduction mixed with protection).In dangerous situations he stubbornly fears nothing, approaches the source of danger very calmly. This is his best move – to go directly towards the opponent, and the stronger one shall prevail.
Well I hope I got that right for the sake of ISTP males out there.