This is even more remarkable when you consider what a wide choice of words we have to use for the subject. This can create problems because most of the time, good sex follows on from good talking. It is of course possible to find yourself sexually attracted to someone, without feeling much affection for them.
Attraction is often something that is communicated using body language and eye contact.
Many people have difficulty in expressing emotions, particularly if they come from a background where emotions were not something that was spoken about. At the other end of the scale, some people need to feel reassured that there really is some level of mutual affection before they can feel relaxed enough to be able to get the fullest enjoyment when having sex. This means stating things in ways that neither of you find embarrassing, distasteful or just plain silly. Establishing this vocabulary is not something that happens quickly or in some sort of formal sit-down discussion. It is something that develops with time as trust develops - it needs both of you to take time and develop an awareness and sensitivity to the responses of the other.