What is the purpose of having sex?

Then they cannot express love in the same way, just as children can't. The arousal is the same though. I can see you are not content without physiological evidence for the connection but I'm not sure there is any to explain love as a phenomenon, there is still Alot unknown about the mind

Does there need to be another reason? We do a lot of things simply for pleasure. We watch TV for pleasure, and read. Why not sex?

Oh piss off, if you can't give an alternative explanation or explain what's wrong with the socially expected reason then I'm out

Whether the arrousal from sex and love is the same or how they are linked can only be proved physiologically but there is no reason not to assume that love entails sex.

Yes people are aware that they want to consummate love but of course it is more of a feeling it isn't a logical decision. Love is the motivation but it is possible to consciously decide whether to act upon it. That was probably Freud's thinking

...outside of making babies, what the reason?

Really? We are having children later and later in life. Rich countries have a lower birth-rate, so it can't be that important.

it does feel good, but, I'm not so sure about this deep connection thing, it only temporary, the connection is more literal than anything.

Emotions metaphorically can be seen as drives. I don't know what's generally accepted but wouldn't you agree that it was an unconscious instinct to want this emotion? It is agreed that there are unconscious behaviours which are not determined by conscious, linguistic thought. Although obviously it is also accepted that neither nature or nurture is responsible alone (this was a debate of the 20th century)

Define purpose.

Why can't both be aspects of love?

Why do we have sex?

I have heard it's because it's an act of love, which contradicts my understanding of love.

I have heard it's because it's pleasurable, which is just the feeling of sex, not a logical reason.

so what is it then?

Burn calories

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Meh, I guess that shows that people aren't only having sex to have children, lower birth rates doesn't mean couples aren't still having sex. At the end of the day, the fundamental feature for the survival of a species is to pass on it's genes, which is done via sex. So it's pretty damn important. Plus, birth rates too low, leads to huge consequences regarding public and private cost.

I don't know about this. But, most people say that they connect more emotionally with their partner when they have sex(obviously it's not the only thing, but it's an important factor). So there must be something to it.

That is different to "what is the purpose of having sex?".

There is not one reason why humans have sex. It is a similar question to "why am I on TSR right now replying to someone who will probably not even take in what I say?".

I do it because I want to and because I can. Humans are complicated but at the end of the day that's the simplest answer I can give you.

How can the pain in loss in love be explained by only compassion?

You just said it's a pleasure. There you go.

Is attachment voluntary?

So you think you can define love?