I think it's meaningless.

I didn't know there was such a thing

There is meaningless sex? You don’t have to be head over heels in love with a person, and vice versa, in order for someone to be willing to have sex with you? When did this happen and why wasn’t I included in on the notification of this change?

Not had the opportunity. But if some lady is willing to share time with me, that is meaning in itself.

How long do you have to wait to make it meaningful. Don't fight the feeling? Any old Port in a Storm (Old Navy Adage.) I had all of my meaningless sex during the meaningless times in my Life. Any Veterans can chime in. College wasn't much difference but you were open to a varied exposure of circumstances.
Read Erica Jung's Fear of Flying, or other erotic tales of literature. Go to Europe, or Asia and enjoy a variety of cultures for a price or and adventure depending on how skilled you think you are or how much time you have.

it's not meaningless

In general, I am a fan.

That would be sex with other people, right?

Idk, back in the day had to "be in the mood for that", a certain myelin on the nerves as it were.
There was a point in time my girl friend and I went through a "notch in the belt" period, switching the game & kept uhm, latex "trophies" clipped on hangers with clothespins & critiques on them. LOL

If there are clever brains behind the "meaningless" act too easy to catch feels quickly.

Don't know what it is?

Whatever turns your crank, but in my case, I'm demisexual, which means I feel no sexual attraction to anyone without first being in a close relationship for over a year. And then, only to that one person.

I would also suggest that casual sex be agreed upon by both parties in advance. Avoids hurt feelings down the road.

I think no sex is meaningless. Some of it is more meaningful, but all sexual encounters touch our heart, soul, and mind.

It beats two aspirin or too much alcohol to treat short term stress or frustration.

I'm not sure what you mean by "meaningless sex" but I'm going to assume you're referring to one night stands or sex without a relationship. I don't see anything wrong with it really.

Fine for those who enjoy it?

I can't, personally. Unless there is a deep emotional connection and I trust the person, I can't even perform.

Basically, If I need to reach for a condom because I'm worried about an STI... I'd rather just masturbate.

I don't believe there is such a thing. Recent prostate surgery has left me unable to achieve orgasm. I miss the sensation.

Sex can't be meaningless since it's so important, compulsive, and even obsessive to most people. And certainly not just for reproductive purposes as so many religions teach. So if it feels good, do it again; if not, don't. That's what free will means.

When you say ‘meaningless’ what do you mean?

Sex is never meaningless, whether it's a store room bang or monogomous long term.
You're talking about what meaning the person has to you, not the act.

I don't view it, I do it. There is no such thing as meaningless sex. IMHO

It depends on your definition of meaningless. If you mean no great attraction but its the only game in town. Then its not what I would go for now. If you mean one night stand and "lets do it coz I fancy you" then that`s something else. I got back with the mother of my daughter and it was not great for me because although I still had great affection for her. I did not really want her in that way. I did it so I could have a better relationship with my daughter but I felt like a hooker. Ended up doing 2 years detox from sex altogether. I also (not at the same time) had a one nighter with a full on lesbian. Now you could say that was meaningless but it certainly was one for the bedpost. I have done hook-up sites and the whole "hello my name is Jane Doe. I like .... Lets get it on. " Does not sit well with me now either

It's empty and unfulfilling.