<Li> Friendship (romantic) </Li> <Tr> <Th> Sexual </Th> </Tr> <Tr> <Td> <Ul> <Li> Casual </Li> <Li> Monogamy </Li> <Li> Non-monogamy </Li> <Li> Mutual monogamy </Li> <Li> Polyamory </Li> <Li> Polyfidelity </Li> </Ul> <Ul> <Li> Cicisbeo </Li> <Li> Concubinage </Li> <Li> Courtesan </Li> <Li> Mistress </Li> </Ul> </Td> </Tr> <Ul> <Li> Casual </Li> <Li> Monogamy </Li> <Li> Non-monogamy </Li> <Li> Mutual monogamy </Li> <Li> Polyamory </Li> <Li> Polyfidelity </Li> </Ul>

3. describe the following dimensions of couple relationships