Iranians will not normally joke about each others wives or other related females, unless if they are very close friends or related. If alcohol is served, males will normally serve the drinks and many women specially the older generation do not consume alcohol. It is best to ask people if they do drink alcohol before offering any to them, however very strict religious people might be offended if they are offered alcohol. However such people either do not socialize with non-Muslims or will make it clear before hand that they do observe Islamic codes with respect to eating and drinking. Many modern Iranians may not follow such codes and socialize freely with few reservations. Food preparation is a major part of any get together and there will be plenty of different dishes. The higher the status of the guests the more elaborate is the party. Guests are constantly served with some edible item, tea or drinks and the host mainly the lady of the house (sometimes daughters too) has the task of serving and refuse to take no for an answer and insist that guests should have what they are offered. This is a very popular etiquette and is known as ‘tarof’. Guests are not obliged to eat everything they are offered and can politely insist on refusing. Tarof has other implications at other circumstances and can be very confusing. People may insist that they will do such and such for you and they might not mean it at all. This is also called tarof, or if you admire something in their house, they will offer it to you repeatedly and again this is just tarof and they do not mean it. There are no set rules but if one is not a very close friend or a close family member most of what Iranians say or offer is very likely tarof and one should politely thank the person and refuse the offer. - See more at: http://www.iranchamber.com/culture/articles/codes_behavior.php#sthash.hme8yIUs.dpuf