A person who does not experience sexual attraction unless they form an emotional connection.It’s more commonly seen in but by no means confined to romantic relationships. The term Demi-sexual comes from the orientation being “halfway between” sexual and asexual.

Yule, M.A., Brotto L.A., Gorzalka B.B. (2017). Human Asexuality: What Do We Know About a Lack of Sexual Attraction?. Current SexualHealth Reports. Volume 9, Issue 1, pp 50–56