I absolutely believe that we do, even without knowing it.

Examples:

I had a married lover many years back who would not wash her pillow, the one on my side of the bed, after I'd left for days, she wanted my smell to sleep with.

I have a pal who has often when we've been out at say a pub, when he's gone into a sneezing fit as a couple or woman has walked by. He would swear that they had not long before had sex and that it always affected him in that manner.

My last GF would dab my cum on her face and swear that was her 'vitamins.' She would save near her nose so that she could keep the smell near.

Another told me that she would save the drips as a condom was removed, taste them and dab them. It just turned her on again.

As a youth, it was a childish male game we played at parties as proof that we'd had sex with certain girls by shoving a 'sticky finger' under a friends nose.

I even now love to taste a partners vaginal fluid and save some on my fingers for later as a reminder.

Why not it is so erotic to become 'one' in that manner.