As one who has lists for most all things related to the marketing end of porn, that isn't a list I have ... usually "no recip" is offered by a brand new directory to get people submitting to it, but after a week or a few days, they require a receipt.

Without a reciprocal link, there's no traffic to the directory which translates into no traffic to your sites. Add a link trade box to the bottom of a page, or manage links with an actual link trade page that you can create with programs like Links Organizer. You can do hardlink trades on your blog sidebar buddy list, or do a link page with an OBVIOUS link to it from your home page ... but do share the burden of creating and moving traffic to and from the link lists you use.