I'm amazed at how annoyed my hubby can get just thinking about the guy that got my first kiss. In contrast, I am not bothered at all that I was not the first girl he kissed. Ah the differences between men and women.
I appreciate that neither of us had other "relationships" (modern term for sexual partners usually) before each other because we were,
and are, serious about life.
In my limited experience, the physical part of the relationship tends to go one way fast. It is best to only pursue a relationship that you believe has a future, but how you go about that is a personal choice.
I have a cousin who's first kiss was at the alter. After years of marriage and 7 children she left her hubby to continue the "swinging" he got them involved in.
I have a sister that dated a man she thought was a great guy in almost every way. She broke up with him because she had no "chemistry" with him. How did she know? Well, she had dated other men and hand holding and kissing happened.
She has been happily married many years now and has four children.
Sex before marriage is a bad idea, but even in that case the "right thing' was to follow through with the commitment aspect if her father would allow the union.
I hope all who marry are happy in the union. Merry-ed, as opposed to sorry-ed.