What term describes emotional, romantic, or sexual attraction to someone of the opposite sex?

The term that describes emotional, romantic, or sexual attraction to someone of the opposite sex is "heterosexual." This term is used to categorize individuals who are attracted to individuals of the opposite gender, and it is one of the most commonly recognized sexual orientations.

In contrast, the other terms refer to different types of attractions. For example, "gay/lesbian" refers to individuals attracted to members of the same sex, "bisexual" describes those who are attracted to both men and women, and "asexual" pertains to individuals who do not experience sexual attraction to others. Understanding these distinctions helps to clarify the spectrum of human sexuality and the nuances involved in sexual orientation.