I am assuming you are familiar with the term sapiosexual. In my ipinion there is an overlap where intelligence is highly attractive. Combine that with confidence and eloquence and you have, in my opinion, a potentially sexy 'partner'. Without a naughty or dirty word needing to be being spoken. It's not just their intellect but also their ability to interact with someone on a level that causes some kind of connection. Being able to listen and mirror a converation. Not being a one sided monologue like this is turning into, lol.
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Listening to his breathing turn laboured when aroused.