You are welcome.
What you can and can't do with the lizardmen depends on whether you take the Green path or the Red path (also called the Good ending and the Bad ending). So far I have stuck to the Green path, so what I know is based on that choice.
Grushk is the brown lizardman. You can get likes with him. It matters where you are in the story progression. At some point when you approach the warriors in the Ruin you should see these choices:
"Training with the lizard warriors" is a scenario where you spar with Grushk. Do it right and you will get likes from him. It is repeatable, though the number of times you get likes for it is limited.
Eventually you will also see a choice when you are in the Ruin to "Check the waterfall" or close to that (I don't have a save of it right now). Again, depending on how you have progressed, you may get to see Grushk there and get likes from him.
There is also the "Hunting contest" task you can accept from Rhot. Rhot, Grushk and Roushk all show up for it and you can get a likes from them all during the contest. The contest is repeatable.
So far I have never got past 50 likes with Grushk, I have not gotten a heart with him, and the most intimate scene is a pretty mild one in the Waterfall area.
OK now Roushk. You can get a lot of likes with him though a number of different interactions, and you can get at least 1 heart with him. There are a number of opportunities for a "sensitive" scene with him.
When you first fight him at the Corrupted Lake you can tease him until you defeat him then have sex with him. If you submit though, you will have to go back and fight him again.
You can also use Reptile's Lure to capture Roushk during the battle at the Corrupted Lake. Reptile's Lure is another recipe you can craft, or you can buy it from the Night Witch. You get the recipe in your notebook when you complete the Night Witch's task to capture a raptor. Study it and you can craft it.
If you capture Roushk you will take him to your Prison where you can have intimate interactions until you decide to take him back to the temple.
During the Hunting contest there is a chance for another sex scene with Roushk . It is pretty obvious what to do when you encounter him during the contest so I won't spoil it with any other details. That's all I know for sure with Roushk.