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I don't think there's a problem in having multiple romance partners and the Logan romance is super roundabout to have just one sex scene with him you need to do a lot of events if you scroll down here in the comments you'll find people talking about it.

You can get hearts with multiple characters, yes (though not all characters, at least not yet). The number varies from character to character; from 1 heart to 4 hearts as of .32. The degree of difficulty also varies. Having hearts with one character does not prevent you from getting hearts with others. Pursue everyone!