Atra sooraa maheshvaasaa Bheemaarjuna samaa yudhi
Yuyudhaano Viraatascha Drupadascha Mahaarathah||
Purujith Kunthibhojascha Saibyascha narapungavah ||
"Dristaketu, Chekitaana, the valiant King of Kaasi, Purujit, Kuntibhoja and Saibya, the best among men."
Yudhaamanyuscha vikraantha Uttamoujascha veeryavaan
Soubhadro Draupadeyascha sarva yeva mahaarathaah ||
Marrying two women and staying faithful to them was not immoral. Marrying two Men and staying faithful to them was also not immoral. But, being already married to one and going behind some one else's wife/husband was immoral. But, of course, we can always limit this to one man-one woman (wife and husband) concept today, which is also good, as long as the Male:Female ratio dictates that as the most desirable concept for today..