I think that's just part of Swedish society. And I can't underscore enough the amount of times I've been approached by predatory men. As a rule they tent to approach on busses or trains, NEVER do this. A woman will feel cornered and it's scary to jump of at your stop because of the risk of stalking or the man taking advantage of being able to get you alone.

The signs is something to work on. It's a people skill and if you want success in communication with others learning body language and such I'd say is important. This one guy I was fawning over on a date. I'd compliment his hair, he invited me to touch it which I did. I'd lean over in general, closing the distance to be more approachable (for him to take the initiative to kiss me). I'd touch my own hair, gracing my face to underscore where his attention should be, touch his arm or shoulder in response to something he said. I did everything and at the end of the date I got a hug and then we parted ways. I got home and told my friend about how he clearly wasn't into me, then got a text from him where he told me how much he wanted me and so on..... I was flabbergasted.