...oh.

recalls times he has told single female friends he was going to take a shower of vice versa; lots of times

Communication has many levels. If I tell you not to think of a pink elephant, on one hand I do tell you that you should try not to think of a pink elephant. On the other hand I give you a suggestion to think of a pink elephant and most people follow that suggestion and do think of a pink elephant.

Different people do that to different extends. There are people who easily form very detailed pictures in their mind and other people who don't follow such suggestion as easily.

On of the things you learn in hypnosis is to put pictures into people heads through principles like that where the suggestion doesn't get criticially analysed.

There are etiquette rules that suggest that it's impolite in certain situation to say "I'm going to the toilet", because of those reasons.

Communication that text based usually doesn't give suggestions that are as strong as in person suggestions. After all the person already perceives the text visually.

As a rule of thumb people look upwards when they process internal images, but that doesn't always happen and not every time someone looks upwards he processes an internal image. That what gets taught in NLP courses. There are some scientific studies that suggest that isn't the case. Those studies have some problems because the don't have good controls about whether a person really thinks about pictures. In any case I don't think recognising such things is something you can easily learn via reading a discussion like this or a book. It rather takes a lot of in person training.

But I don't think you get very far in seducing woman by trying to use such tricks to let woman form naked images of you. There are PUA people who try that under the label "speed seduction" with generally very little results.

Trying to use language that way usually get's people inside their heads. Emotions are more important than images.

You might want to read http://en.wikipedia.org/wiki/Four-sides_model .

If something a woman says to you in a casual context you can think about whether there's a plausible story about how the woman says what she says to signal attraction to you.