wide shoulders in a man = small waist and hip ratio on a woman. scientific fact...so strong arms and a woman feeling secure in them would be the equivilant of you feeling vulnerable in the softness of a woman's body or of the softness her skin.
idk about an equivalent feature but I just wanted to throw out there that I don't find big arms attractive. I don't want them flabby or anything, but average of skinny arms that are relatively toned are perfect for me. Really big arms/muscular arms are actually a turn off for me.