Tunica albuginea of the penis is similar to tendon and ligs. Skin is another example of connective tissue, but is not that similar to tendons as you can easily realize.
Most of studies on properties of connective tissue were done on animals, back there. If you go ahead there are studies on humans too, and some even on the human penis. Jump all the bitching in the first pages and you’ll find a lot of interesting material.