What's the best way to find a co-parent

[NotTiredOfLondon]

Hello, I know few websites where people can have a profile and search for a co-parent but it seems to me more a place where most of the members look for a donor instead of a proper co-parent. Has anyone a better suggestion where to start the process of finding a co-parent, for example a lesbian couple/single person who would like to share the responsability of raising a child with a gay/single couple? Thanks