Whenever guys say "it's so much easier for women to get laid" women usually respond with something along the lines of "yes, but it's so much more dangerous for women" or "women are less likely to orgasm". I'd argue that even when accounting for these factors, it's still far easier for a woman to get satisfying sex than it is for a man. This is because:

1. Men have near non-existent standards for casual sex

2. At any given moment, there are far more men than women looking for casual sex

3. Women do not need to approach.

By virtue of sheer quantity of options, a woman can filter for those who are willing to be "good in bed". She can get a far more attractive guy for a casual hookup or STR than she can for marriage because supply and demand works in her favor. It wouldn't be very difficult for a woman to simply ask around in order to figure out which men are good at giving women orgasms. There are plenty of guys who will put in effort into pleasing a woman because he hopes it will improve his reputation and enable him to sleep with more women.

I'd argue that the real reason why women don't engage in casual sex is because there isn't any real validation in doing so.

I'd even go further in saying that dating is easier for women at all levels including marriage simply by virtue of not having to approach or put any effort into setting up dates. There are so many men who end up with the first woman who was willing to go on a date with him. Women aren't just the gatekeepers of sex. They're the gatekeepers of everything.