This sensitivity to gender difference, gender seclusion and modesty outside of marriage can be seen in current prominent aspects of Islam, such as interpretations of Islamic dress and degrees of gender segregation. In Islam, prohibitions against extramarital sex are strong and permissible marital sexual activities are familiar subjects. In these permitted relationships, there are also some limitations as well as permissions: a man should not have intercourse during his wife's menstruation and afterbirth periods. He is also considered to be sinning when penetrating anally.