Many adult singles groups have a disproportionate number of men and women, often with more females in attendance. The Idea Catalog for Single Adult Ministry offers a creative suggestion to remedy this problem.
When planning an occasional social for your group, stipulate that women who wish to attend must bring a man they are not romantically involved with (i.e., a brother, uncle, cousin or male "nonromantic" friend).
If every woman in attendance brings a male friend or relative, it helps round out the numbers and makes for a more interesting evening socially. It may also help get more men acquainted with your single adult ministries.