This study compares same-sex friendships, cross-sex friendships and romantic relationships in young adulthood in terms of the negative effects of various conflict issues, the different conflict management strategies and relationship maintenance strategies employed in these relationships, as well as the perceived rewards and costs, the integration of the networks, and perceived overall quality. The main purpose is to investigate cross-sex friendships and discern its similarities to and differences from romantic relationships and same-sex friendships, as well as the gender differences that emerge. Data is collected by means of questionnaires, from a sample of 298 Middle East Technical University Students. Cross-sex friendships were rated as the poorest relationship in terms of quality, rewards/costs, or the frequency of maintenance behaviors and conflict occurred at very low levels in these friendships. Women employed more relationship maintenance strategies in their same- and cross-sex friendships compared to men. In addition, men preferred the dominating and women the accommodating strategies of conflict management in their same-sex friendships. It was concluded that same-sex friendships remain to be the accepted and approved form of friendship among this sample of Turkish young adults and cross-sex friendships were distant and inferior to the other two relationships. Finally, there were some differences across these relationships as to what predicted relational quality, yet in general the rewards and maintenance strategies predicted quality better than costs and conflict behaviors