Check out Team OC. They are an AIDS/LifeCycle training group. The ALC calendar is a great resource for finding riding groups, even if you are not doing the ALC. On all the training rides I've been on, we've been very welcoming to anyone who wanted to rides with us. ALC training rides also tend to be very gay.
Here's their ride for this Saturday: http://www.tofighthiv.org/site/Calendar/819749392?view=Detail&id=154842
It is the season where we start ramping up our training for the ALC so as we get closer to June I'm sure the rides will get progressively harder. At least our group that leaves out of Santa Monica does. The rides right now are probably pretty easy 40-50 miles with a climb or two.