You can love more than one child equally, so why not more than one lover? Not something I've experienced personally but some people certainly say they love more than one person romantically and I take them at their word.
Yes, of course. I don't see why you can only be in love with one person at a time. There probably wouldn't be as much adultery if that wasn't the case. There are people in the world who also have three way relationships, and are perfectly happy with that arrangement.
I think this is a great question. I have always wondered about it but don't know the answer.
I am leaning to say that traditionally, it is only acceptable to love one person at one time. I sometimes wonder how it would work out, if a man or a woman loved more than one person, would they all love together; it seems a but complicated.