you've got a good domain, and it speaks directly to your description of being available at a certain day/time.
Why isn't that description on your website anywhere?
Particularly in the very popular dating space, you need to set youself apart. you say 'no frills dating' which has absolutely no meaning.
If I've got what you are doing correctly you are doing a 'who else has a free night and wants to go on a date'?
that has value. But you have to tell people.
From a design perspective, your orange highlighted items look like links, but they are just highlights, so I'd look into fixing that, and I think you should move the sign-up to another page to give yourself more room to explain why your site is better than the rest.
Also, the problem (if I understand it right) is that most dating sites when they are just starting out don't have enough people on them, so I think you need to make sure you have people looking for dates, or good ways to invite people.
You need to make it look like the site has activity and that people are getting dates or looking at the available slots.
Also, that image of the perv grabbing that girl is really bad. I've always been surprised that dating sites use real people in the image rather than a silhouette where the person viewing the page can kinda see themselves in it.
Just my cents.