Are friends helpful when meeting potential partners? Or do they compete with you for mates? It turns out that males receive help from friends (of both sexes, but especially male friends who are not single themselves) in attracting desirable mates, while women receive help from friends in avoiding undesirable mates.
Ackerman, J. M., & Kenrick, D. T. (2009). Cooperative courtship: Helping friends raise and raze relationship barriers. Personality and Social Psychology Bulletin, 35, 1285-1300.