Guys, right time to have sex or talk about sex for serious relationship?

Think beyond the dick for a sec
If a woman wants you to take her seriously for potenial long term relationship, should she really have sex early (after 3 dates is early to me) ? Or wait? Do you think men are often likely to take her seriously if she has sex before theyre committed?

It seems a lot of guys have sex long enough to get what they want then theyre onto the next. But they also claim they want us to go with the flow and get sexual when the vibe happens organically which can be too early for those of us who are on the freakier side xD

advice please!
Guys, right time to have sex or talk about sex for serious relationship?
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