Things that make you say WOW?!

The first time I had sex witih my most recent ex-girlfriend, we were doing it doggy style and I was on the verge of climaxing. I told her I was going to come thinking I would pull out and shoot it on her back or butt or something, but instead she spun around, grabbed my dick, and put in her mouth and stroked it until I came in her mouth. It was the first time I ever climaxed in a girl's mouth and the fact that she initiated it made it even better.

Definitely a WOW! moment in my life's sexual escapades.

my ex licked my ass. never had it done and it felt amazing. wow.

girl used her tongue while giving head. that was amazing

When a woman orgasms easily.

Once I was having sex and she orgasmed simply from intercourse within 5 minutes ( some girls will say fake. but after a few times of meeting her, she simply is a girl that orgasms very easily)

I wasnt even warmed up and she came and went to sleep.

It was a weird wow, but a big wow nonetheless

a properly executed lap dance while having sex (see the movie showgirls, lap dance scene, envision actual sex vs clothes on)
for men, its all about sensual stimulis, physical contact. I doubt women pay attention to something as simple as a hug, but men and women hug differently.
men step into an embrace with a woman, but women bend slightly so that only the upper torso comes in contact with the other person. there was one exception, there was this girl I used to know, she hugged and slightly grinded herself to me in the embrace, but that only happened once, but it was hot

A surprising twist while having sex, my guy stuck my own finger in my ass. It was interesting, to say the least. Then we did that again, but my finger in my vagina and him in my ass.

I had a guy go down on me after we had sex it was fantastic, blew my mind ;0)