ADubsFriend -
I commend you. Yes, I believe you can love more than one at a time. Obviously, parents love each of their children and the joys brought from each of those loves is different, but just as strong.
As far as adults, absolutely. For those that have never experienced it, it is a foreign idea. For those that have, it is a sincere test of character, emotional stability, self reflection, assertiveness, compassion, empathy, and sorrow. I believe it is on the same level of internal confusion as a death.
Love has many definitions, the least of which I believe is sexual. Sex is a physical act. Love consists not only of how we feel, but how we act upon those feelings. I believe you were very accurate in saying you loved both men. If, however, you ran off for a week and caused havoc in both marriages, obviously lust was at work, not love.
Love takes some very strange turns. One of the best books ever written about today's marriage and the application of love is "Open Marriage". It is not necessary to agree with everything written in this book, but if it were read as a couple, both partners would have a sincere appreciation for honesty, boundaries, sex, trust, jealousy (or the unneccessary need for) and many other common issues regarding intimacy.
Is loving more than one considered morally wrong? It seems that way, but I am not sure why.
Is it ethically wrong? If it is acted upon in ways that are destructive to other parties without taking the time to consider their feelings, then yes, it is ethically wrong. But if LOVE is at work, these things won't occur and it is not ethically wrong.
Can a marriage exist, or rather grow and be rewarded by loving more than one? If your spouse recognizes that even though you could go to the mall tomorrow and find someone else to love, to share thoughts and dreams, to even have sex -- and your spouse also recognizes that he can't control or own your feelings -- and your spouse recognizes that in order to allow all of these natural parts of your existence to grow instead of eroding away and yet he wants you to come share the evening with him -- yes, your spouse will grow and the marriage will grow accordingly. In turn, each of you will be more open to allowing LOVE from others into your life.
With Love and Best Wishes,
one_ugly_time