Men have lot of fetishes. If your man ever told you something and you refused to do it, time to do it now. Of course as long as it is not painful or disgusting you should give it a try. This can involve things like roleplay, sex it a particular position, anal sex or similar. if your partner is open about his/her sexual fantasy; you can really make him/her big time happy by doing something he/she always wanted you to do.