Does this make me sexist?

I made an interesting discovery about myself this week.  I enjoy meetings, social events, volunteer opportunities, etc. more when they involve men and women.  This week I attended a lunch meeting of a group I'm thinking about joining - a group of men and women - and found it very enjoyable. Also this week I received more information about another group I'd been thinking about joining, discovered it was all women, and felt my interest plummeting.  I should note here that I do currently belong to two women's groups that I find very enjoyable, so maybe it's just a matter of two being enough.  But I think maybe it's more than that.  I was raised in a family with two brothers, I've worked all of my life, in several different jobs, but always with men and women working together, so maybe it just feels more natural to me. Or maybe, deep, deep down, I'm hoping some hot 70-year-old will come along and sweep me off my feet????