Here’s a couple of sites that don’t charge women for joining but do charge men a low fee.

Girlsdateforfree: "Online dating in the UK, sign up for free, meet people online, find an internet penpal or chat with 1000s of singles"

This is a frre dating site in the UK for women that, apparently, does not charge for girls. But I have not joined or know any one that can vouch that it is totally free!