I used to be an editor of a dating category on Dmoz. I gave it up due to time restraints. I used to receive 100's of applications a week. Things that will get your submission ignored:
Content. You must have a decent website. It must have original content that will enhance the directory. The content should have good grammar and be error free. No 404's. The editors will spend some time going over your site, if it's low on content, with errors it will be rejected.
1: Wrong Category - we had a facility to move this to the correct cat and notify the editor. But a lot will just delete it. Sometimes an editor would disagree and send it back to you and on it goes like a merry go round!
2: Non promotional title - don't include the words best, greatest, excellent, fantastic etc etc - make your title short and to the point. Preferably use your business/website name. Don't keyword stuff it.
3: Description - Grammar perfect, correct spelling, short and concise. If you get the first 2 parts correct the editor may well change your description anyway. But make some spelling mistakes and it will get deleted. Do not self promote or keyword stuff in the description either.
4: Do not write in ALL CAPITALS.
5: Capitalize the first letter in the title not every letter. This Is A Good Title - THIS IS NOT A GOOD TITLE
6: Do Not Start Each Word In The Description With A Capital Letter. This is for titles only.
7: Do not mix up your Capital letters And Stick them every Other Word, it Looks awful!
8: Do not submit to multiple categories. This gets flagged as already submitted elsewhere and will result in your submission getting deleted
9: Search on Dmoz to make sure you are not already listed. Nothing pisses an editor off more than finding out that your site is already listed. If you do this often, they will delete the listing you have approved and you lose it. This probably happens with people using auto submission software.
Here's a tip that worked positively with me every time I received it.
Contact the editor of the section. Just click on their username and send them a message. Be friendly. Say that you submitted your site some time ago, you appreciate they are very busy but noticed it hasn't been approved yet and you just wanted to make sure that you had completed the submission correctly. You might want to ask them if they could suggest any improvements they could make to improve their chances of their submission being accepted.
If your website requires registering (a lot of dating sites do) you need to provide temporary access. Include a temp user name and password for the editor and send it with your submission. If they can only access your front page your submission will be deleted. They need access to all of your site.
I would suggest going through your relevant category to the bottom of the tree. You have more chance of being accepted even if your site is relevant to a higher level of category. For example, if you had a dating site targetting Texas, your chances of being accepted would be better if you went through to the regional area and submitted your site, rather than the top of the category under Personals.
There is a hierarchy with the moderators. A super mod will control the top level cat and can edit all cats below. Lower mods are on trial and will not risk poor sites being added because it will reflect badly on them. Higher mods will come down and remove sites and warn the lower mods.
So if there is not a mod for your cat, don't worry the mod above has access to it. However if his/her top level cat is full of submissions they may well take some time to check lower categories. But I know they do. They used to come into mine and make changes and recommendations. If there is no mod, try the contact method above to the mod directly above your cat.
Good luck