I don't think the problem is in the legs so much as it's in the hips and the way the legs attach to them. (Semi NSFW): Example. The femurs attach to the outside of the hips. The only thing filling in the space in the middle is flesh so you'll have a gap between the legs starting at the crotch. Right now it looks like your legs are just coming together at the top.
Don't forget that the bones are what defines the shape of the legs. Legs have sort of an out, in and down curve while simply standing up. Example2. The femur starts at the outside of the hips, swoops inside to the knee and continues downward through the calves.
I have pointed this out to you before and I can mostly see it here on the inside of the legs belonging to the woman on the right. Be careful about how you cinch in the legs at the knee. Knees have mass dividing and joining the upper and lower leg simultaneously. The contours of the musculature should flow in and out of the knee section gracefully. You can see this in Example2. As long as were on the subject of knees I'm noticing that most of your joint areas (hips, shoulders, elbows, etc...) need study as well. There is stuff between limb sections, not just a blank area where the body bends :b
Legs seem a bit short on the right while the torso is too long, being more correctly proportioned on the left. Hands are too small on both. It's really just a bunch of little things like that overall.
But man, I have got to be honest with you. I'm familiar with your work, I've been gone a while so I looked over your whole thread again to brush up. I saw a lot of very good critique and I saw a lot of you promising to take the advice to heart and study. I've seen a few studies and a few copies of other art, but I really feel like you keep falling into your old habits regardless of what you have been advised of and what you seem to have learned. Now I'm probably going to get all sorts of hate for this: I don't want to insult you but I'm really not seeing any drive. I see a lot of you begging for critique and not a lot of change.
Practice from reference man and do it until your eyes bleed and the human body is cemented in your brain. If you do studies of a certain body part, include what you learned in your full body drawings. If you haven't studied Andrew Loomis yet, for the love of god study him. Most of his books are available for free online in PDF format.