Im not entirely sure what your question is about making love...
If it is whether you should or not...that is something very personal. If you can do it without any expectations that it means anything more than physical comfort and relief, then i would say go for it. If you expect that it means things are getting better and you will feel used, hurt, or disappointed if things dont work out, then i would wait until you are on more solid ground.
Either way, as you are unsure if he had a PA, I highly recommend getting a checkup for STD's and using protection.
Its a hard call because men feel emotionally connected to women after ML. Women feel emotionally connected and that makes them want to ML.
As far as why he might iniate...he could have had a physical need, he could have been wanting to show you he loves you, he may have been checking your reaction, or the wind could have blown too hard.
Posting from my phone, which I hate, so taking a break for a few. Lol.
"Acceptance doesn't mean resignation. It means understanding that something is what it is and there's got to be a way through it."--Michael J. Fox