I’ve never actually had any of the three options mentioned. I suppose I’ve come closest to #1, yet I’ve never truly been in love. The best sex I’ve ever had was a one-night stand. I’m probably some kind of freak, or something.
Number 1, for the first time. I suppose it could be argued that sex with someone for the first time can’t be “love” sex, but… nah.
“New love on the doorstep, isn’t it funny, there’s nothing on how it works” - it’s all fumbly and… mm 
Given the options…
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Can’t be beat. Best sex in the world. Nothing more to say on that one.
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Never had it, at least as far as I can remember.
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Did it once, and it was a terribly empty feeling. It was her idea and I went for it. Looking back on it, although at the time it was a grunge f–k on my part, she had an incredible time, which only added insult to injury.
Give me relationship sex anytime.
Outside the options though, I’ll second the sex amongst friends option. It can be very very nice:)