New here, but this thread caught my attention first because this how my wife and I got started.
My wife (Tiff) and I were in college. Not yet married, but living together. A good friend of ours (Lou) lived in an apartment around the corner. He spent a lot of time at our apartment because he had a crush on Tiff. He would actually joke about it with me. However, I could tell she had a crush on him, too
Tiff was very comfortable in her own skin. She would always show a lot of skin in public. If she and I were invited to a pool party, she would usually be the first one to get naked and start everyone skinny dipping.
She was usually naked in the apartment. But, if Lou came over, she would wear a loose t-shirt, or walk around in her bra and panties. It definitely helped increase the sexual tension between the two of them. It didn't just turn him on, it turned me on, too.
She was also very touchy-feely. When Lou would be leaving our apartment, she would always give him a hug. After a while, she started giving him a small kiss on the lips, too.
While having sex one night, I told her how hot it was when she kissed Lou goodbye. She just grinned and giggled a little from my comment.
She, apparently, decided to turn it up for me. Her kisses goodbye to Lou became longer and more passionate.
I understand why some guys, even cuckolds, draw the line at kissing. It can be more passionate and stir emotions more than sex itself. For me, though, if confirmed my cuckold desires.
Long story short. She ended up not only having sex with Lou, but we bacame a poly threesome for over a year. Did she fall in love with Lou? Yes, but she still loved me more and we ended up getting married. That was over 30 years ago.