Anytime I have been single, I welcomed/expected to discuss it or more than likely, at least talk about sex alot as flirting before actually having sex.
I am ashamed to say that when I was married, I remember expecting sex much more than I had sex with my ex. Probably due to lack of communication, so...
I believe that the feelings of fear of rejection or having insecurities isn't a female issue as much as it is whomever in the relationship has the least self esteem, so your topic seems to insinuate these feelings and fears are only on the female side, but could be on either ide in my opinion.
Either way, communication is very important.

I get that for men it can also be difficult or awkward and can make them insecure.

Big difference is though that when having sex women's bodies produce oxytocin which makes them want to bond, have a commitment, and all that comes with it.
This ALSO happens when a woman has NSA sex. It's our biology, not something we can control.

Men on the other hand release testosterone which makes them want to be off after the deed to impregnate other women.
MEN DO NOT BOND THROUGH SEX, WOMEN DO.

That is why NSA is much harder for women and usually only happens when alcohol came into the picture.

As such, what I wrote is far more applicable to women, certainly in the early stages of a new connection.
This is also why it is advised to women to not have sex with a man very early on. Sex CAN work as bonding, add to bonding, for a man but there have to have been other emotionally bonding moments for that to happen. Without those moments a man can have sex and simply walk away, never show up, never call again. Likely even forgot the woman he had sex with exists.
It does NOT work that way for a woman.

Based on all that, I think the moments that a man can feel insecure about having sex with a woman is AFTER there have been emotional bonding moments. So when having sex means something to him other than getting his rocks off.
GEnerally speaking there's loads of men out there that only seek that: getting their rocks off, so as a woman you have to be careful, and sift and sort or get hurt. Or pregnant even as generally speaking a man doesn't have a condom with him or he doesn't want to wear it.

Crystal, that sounds like a bunch of misandry dressed up as pseudo-science.
I don't buy it: it doesn't match the talks I've had with men, nor my experiences with women.

I get that for men it can also be difficult or awkward and can make them insecure.

Big difference is though that when having sex women's bodies produce oxytocin which makes them want to bond, have a commitment, and all that comes with it.
This ALSO happens when a woman has NSA sex. It's our biology, not something we can control.

Men on the other hand release testosterone which makes them want to be off after the deed to impregnate other women.
MEN DO NOT BOND THROUGH SEX, WOMEN DO.

That is why NSA is much harder for women and usually only happens when alcohol came into the picture.

As such, what I wrote is far more applicable to women, certainly in the early stages of a new connection.
This is also why it is advised to women to not have sex with a man very early on. Sex CAN work as bonding, add to bonding, for a man but there have to have been other emotionally bonding moments for that to happen. Without those moments a man can have sex and simply walk away, never show up, never call again. Likely even forgot the woman he had sex with exists.
It does NOT work that way for a woman.

Based on all that, I think the moments that a man can feel insecure about having sex with a woman is AFTER there have been emotional bonding moments. So when having sex means something to him other than getting his rocks off.
GEnerally speaking there's loads of men out there that only seek that: getting their rocks off, so as a woman you have to be careful, and sift and sort or get hurt. Or pregnant even as generally speaking a man doesn't have a condom with him or he doesn't want to wear it.

This came up by Matthew Hussey, and I thought it was an interesting topic, and important too.

Many women have sex with a new guy without ever talking about it first with the man. That means they don't know if the man has the same reasons and feelings for having sex as she does and which leads to feeling rejected or used or whatever if the man ghosts her after sex.

Most don't talk about it prior because they're scared he'll be off, maybe fear the sense of rejection if he does, and/or they lack confidence to address it as it's a vulnerable conversation to have.
So most end up going with the flow and having sex regardless, thinking & hoping it is as meaningful to him as it is to her.

Condom-use often knows a similar issue. Many women daren't state their boundaries on this, and thus end up having sex without protection.

As such the question:
Have you as a woman addressed this prior to having sex with a man?
If you're not ready or not seeking a hook-up and deep down only want/have sex when it's meaningful to you, do you assume it's the same for the man? OR do you talk to him about it?

And if you're a man, how do you think you'd feel if a woman would address this prior to having sex?

PLEASE KEEP THIS a decent conversation and PG13!!

If you want to watch the clip from Matthew:
http://www.youtube.com/watch?v=7raum5mnM7U&t=289s