Can a guy not be just friends/platonic with a woman they've slept with?

I value the time I spent getting to know the guys I slept with (not relationship guys. Just sex for fun guys when single). But now I have a boyfriend I was hoping we can still chat but keep things platonic and civil. Because I know I can do that. But my boyfriend and others think I am being naive. That if they remain friends with me it's only because they still wanna hook up?

Can a guy not be just friends/platonic with a woman they've slept with?
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