My female friend thinks it's ok for a lady to have feelings for two guys

On a warm Tuesday afternoon, my friend randomly brought up a topic on how it is possible and even OK for a woman to have romantic feelings for two guys at the same time.

I don't really remember all the details that led to the conversation, it probably was me who asked a random deep-thinking question as I randomly do to have a small talk or at least quench the deafening silence, but her response hit me differently all the same.

Valid enough, her response came with a very deep sensation of passion and as if it has been a conversation she had been waiting for for a long time, having so much to express, but in the initial minute was only able to repeat the same phrase “It is very possible, and it's not wrong”, a couple of times. Or at least that's how I remember the conversation playing out.

Her idea basically, is that it's possible for a lady to be in a valid relationship and be also quite close to a friend as long as she's faithful and committed to the said relationship. Also, it's mostly emotional or hormonal and there's nothing she could do about it in very fact. Or at least that's what I got from the transaction.

It may make a bit of sense I guess, the ability to go a thing and to do otherwise is where choices step in. Also, the ability to falter, but the choice not to is where discipline comes in. However, why do we have to come to a place where we have one autocratic decision? This is me trying to further buttress her point. Order may not be in the inability to be chaotic but in the choice to avoid the chaos.
(*My mind running through several pop culture references to reinforce this, but not knowing what resonates best with my audience*)
I guess we all go through this at one point or another. Most probably that's what was going on in her head at that instance. The crazy blend of do I have to explain myself; how do I go about it? Is it worth it? And maybe, what will be the reaction? Mehn, that would have had to be stressful.

Anyways, I guess the fear of the conversation escalating and other random persons weighing in on the gist made it come to an early end with her just randomly and repeatedly stating it's “possible and OK”. I wouldn't blame her anyways, it was a large class filled with busybodies that wouldn't mind pitching in if they had the chance, plus their input may not be too respectable and direct. Either that or she lacked the facts to properly support her position on the issue which would be very much unlike her normal self.

My position anyway was that it doesn't sound right. Romantic feelings should be reserved for a single person and a single person alone. Before you weigh in, imagine your partner trying to explain to you why he feels the same way for another person as he feels for you. Hold on, and it's not obscure or random, now, imagine you get a name of a person you both know and he acknowledges, “Yeah, that's the person”.

Now let's have your honest comments.