Hey, I have three holes and I use them interchangeably, with cocks thrusting in and out until they cum! That is sex!
Quite the conundrum! I have found a few married FWB over the years when I was single/divorced that had no problems with stepping out, but drew the line in the sand with penetrative sex. Oral was just fine. but a couple wanted the full Monty. For some reason that is where I drew the line. I could go down on them until the sun came up, but I felt some guilt about the possibility of screwing a married woman. Stupid, I know! But, I got the vibes that they were looking for a replacement husband. Obviously they were not happily married, or sexually satisfied by their husbands. Yeah, I wanted the full thing with them, but…..? Looking back I wish I had. it is/was their marriage, so why should it matter to me? Probably because they were long-term friends that I cared about. Talk about a complication! Almost 30 years ago!
Oh, yeah, I remember the first time I had sex with a married woman. Asked me what I knew about "eating at the Y" and when I told her that, yeah, I knew about it, she took me by the hand, led me to her bed and I hesitated because she was a married woman. She said, "The man that hired you? The one I'm married to? He doesn't eat at the Y so... what are you waiting for?" I... feasted on her. Used everything I knew about eating pussy and probably learned some stuff I hadn't known about. Knew I shouldn't be doing this with her. I got mugged with my head between her legs before she deliberately laced her fingers in my "Angela Davis Afro" and pulled me up until I was lying on her and she used one hand to insert me into her and whispered, "Fuck me..." I fucked her... while wondering what would happen if her husband were to come back home and catch us like this. The fear was... delicious, scary, exhilarating and I had to cum and said so. She said, "Then do it, lover..." and it all went to my head and I exploded. And felt shitty for having sex with a married woman. She must've known how I was feeling because she said, "Yeah, I might be married but I'm still a woman who has needs... and needs you took care of. Maybe I can get him to hire you for other things around here?" I realized later that I hadn't felt bad while I was eating her delicious pussy but did when she put me inside of her... and I would later get over the conundrum. Your hubby/boyfriend not eating that thang? You've just met the right person because if you want it eaten, I'll be happy to. Is it sex? Hell the fuck yeah it is! Wife/girlfriend not of a mind to suck you off? Pull it out and let me show you the truth of something you were taught not to know or believe.
I think the answers we may give to the OP question may reveal a responder's basic thought mechanism. Firstly if one is to quote someone, they must get it correct. That is not a quote of Bill Clinton. I don't agree that if an orgasm is involved it's sex. But, then, I don't think in absolutes. I don't think it must be one or the other - sex or not sex - because there's a whole selection of things to do only a couple of which requires penetration. If I were to describe, as sex, something a woman and I have done it would mean I have fucked her. Or she has fucked me, or both. To say I had sex with her when I have merely gone down on her or had a BJ from her would be incorrect, a lie, even. It used to be that if clothes came off, even partially, sex would happen, which means that in some way my cock would have been in her pussy. I would consider that to be sex. More recently I have enjoyed experiences involving just oral or mutual masturbation or simultaneous masturbation or other fun that hasn't involved any penetration with my cock but which has involved orgasms for us both. Thats not sex. It's not even 'full sex', a term I've heard but, which, I think, is quite meaningless. For some, full sex means they did everything. For others it means there was fucking with their assumption (or premace) being that penetrative sex is the summit or culmination and the last thing to be done on the 'fucking menu'. For others, it means they did the 'big' one - penetrative sex, regardless of whether there were oral, fingering or anything else. Like a quicky. Knickers off cock in, explosions and that's fucking at its more raw. So to answer the OP thoroughly; whether it is sex, it depends on the thought processes and mindset of the responder as well as the activity they did together. Legally; to prove rape, penetrative sex must have happened. If it didn't it wouldn't be sex regardless of the consent aspect. So, for clarity, to 'be' sex, their must've been penetration with a cock.