What sensation is fleeting, yet is a huge turn on?

[MaximTerhune]

I love hearing the frustration of a womans breathing when my cock accidently slides out of her and the intense moans of approval as it is pushed back into her.

 

[Mrtenant]

I love hearing the desperation of people at the door when I've locked myself in the only bathroom

 

[TwystedDzyre]

Walking alongside one's wife/GF, and passing by another insanely yummylicious female, who, whether she meets your eyes or not, triggers a deep yearning of cheat-fucking her by any way possible.