!showerthoughts
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Humans have other senses besides sight you know? Taste, touch, smell and sound are all heavily involved in sex. And if you can sense them, you can imagine them. Do you need to see your partner to get aroused?
(Also, a majority of blind people have not always been blind, so I imagine many of them still also imagine what someone looks like)