I understand completely, I don't get kissing.( I say kissing as mostly mouth to mouth kissing. Depending on the person kissing on other parts of the head or body are usually platonic, or sexual.) I have done it probably a total of 5 times in my life, 3 of those instances I was drunk, and each time I hated it.
To me kissing is highly romantic and something I can't get behind at all. Like my brain categorized kissing as romantic, and as romance repulsed, kissing is a nono.
I don't like kissing, watching people kiss, or even watching animated people or animals kiss. To me it is disgusting.
Even when I have sex, I don't kiss. It's a rule I have with my partners that you can kiss anywhere you want but my lips/mouth is off limits, you kiss me there and we are done.
Along with this I don't understand kissing, like it's nasty. There are more germs in a human mouth than a toilet. Like I don't understand how having a mouth on your own mouth is enjoyable.
To me I would rather, much rather, put my mouth on someone's genitals than on someone's mouth. I don't get it, and to me kissing is just repulsive.