@Susan722
If you are a single female living alone and will have to share living space with guests, then you are allowed to accept "FEMALES ONLY", but it MUST be clearly stated in your listing description and house rules. Despite this rule, if any men were to book with you, then you can get the reservation cancelled without penalty.
Since you say you have IB on, you can decline to host claiming "uncomfortable hosting this guest", BUT I would suggest you do not mention the race of your guests EVER. If you say 2 Asian men, people will focus on the Asian part not the MEN part. Are you uncomfortable because they are Asian or because they are men? If the guests were 2 Caucasian men, would you feel any differently?