The Invisible Man, by Jil Hall

The Invisible Man was lonely. He was 30 and had not yet met that special person to be his significant other. So many women were initially intrigued but then found his invisibility to be a hindrance to their intimacy. However much he tried to modify his behaviour to meet their needs, sooner or later, they became repelled by his invisibility.

Then one day he met the Invisible Woman. They fell deeply in love. They dated for six months before they tied the knot. They were incredibly happy. Then they had a baby. Mind you, he was nothing to look at.