Any know what kinda pill this is?

I have an idea but I’m curious if I’m right. So wondering if anyone knows! It doesn’t have any letters, words or numbers on it. Just the one line you see here.

I think it’s a viagra of some sort but the fact it had nothing written on it made me question! I found it in my couch, and I started seeing a guy not too long ago so wondering if he takes it and I just never knew it? Would I know if a guy is taking viagra?