Guys, First date... everything but sex... why?

I went on a first date with a great guy... we have very good chemistry. We went back to my place and did almost everything in the book except have actual sex. Im very confused...
He expressed verbally and physically that he was very turned on... lots of passion while doing all those other things... but no D to V. We have confirmed we would both like to see each other again very much... which im happy about. Just confused... so close to home plate but didn't take the slide... why?
Guys, First date... everything but sex... why?
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