TheWilli:
We try to keep cross-gender friendships in a family context.
Walter, may I get on my soap box for a second? This is no attack on you, I found that the Botkin sisters occasionally did the same. Henry Watson Fowler, an English schoolmaster, lexicographer, and commentator on the usage of English, once said: "Gender...is a grammatical term only. To talk of persons...of the masculine or feminine g[ender], meaning of the male or female sex, is either a jocularity or a blunder."
For those who are familiar with English and American history, our language is shaped over time. I think you will not be all that surprised to learn when the word gender took on its new and unfortunate meaning.
(stepping off my soap box) Carry on!