What are sexual interests?

They are what you are interested in sexually. Depending on the context, this could be taken as what are you sexually interested in such as what body feature turns you on the most. It can also refer to what you are interested in doing sexually, such as positions. It can include perhaps fetishes and what type of role playing that excites you. Basically, it's whatever will excite a person sexually; ie. get them horney and in the mood for intercourse.