I have always found that most people like to be single during the summer months and only really look for a girlfriend or boyfriend when winter comes and it's too cold to go out much (I don't know how it is in places where it is warm 365 days a year). However, if any of the babes on Summer GF wanted to get serious I would say yes regardless of the temperature outside. Also, the temperature has nothing to do with the fact that all the site's content is taken from the larger Videos Z site. Let me explain.
You see, you actually have to pass through VideosZ first when you sign in. From there you need just find the SummerGF site listed along the left-hand side of the page and there you go. You might wonder why it happens that way, but it makes more sense when you realize that all 316 episodes come from the big movie site itself.
As far as the theme goes, from the looks of it they are filling the "summer" site with scenes from the huge movie site that all have a basic summertime theme. Many scenes take place outside (or at least start there), while there are also "college party" and car-banging scenes. In the end it is a very loose theme and you will find orgies, gangbangs, threesomes, anal sex and more.
Each video comes with a set of vid caps and you always have the option to download the flicks as well as stream them. Quality of the videos is generally good with some offering great-quality bit rates. You also have the option to save it to your collection, which is like saving it to favorites and you get content tags to filter the collection as well.
There are more scenes now than when we were last here, but the collection isn't presented in chronological order, so it is hard to determine exactly how often they're updating. Considering there are only 28 more scenes now, I think the answer is not often.
On the plus side, there is enough Summer GF content already here to keep you busy for a while and you get full access to the huge VideosZ site as well, which is where the real value is.