It seems Lio creator Mark Tatulli and I share a mutual dislike of Love Is.. This overly-sweet (in my opinion) single-panel strip has been running since 1970, and despite a new artist taking over the reins, it still seems like an artifact from that era.
Tatulli's brought in characters from other strips before, with uneven results. This time, his take is note-perfect, capturing the look of "Love Is..." And he manages to include some subversive humor as well, suggesting that at least one of the character has had enough of the strip's cheap sentimentality. (click on image to enlarge)