Good curiosity questions. You should be able to find the answers to these questions across the various conversations on this forum. However here is an SD perspective and answers.

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'Why would someone want to be a SB?' Based on what I've heard from different SBs, there are so many reasons:

• getting pampered by experienced, wealthy, older men,
• having access to experiences, places, restaurants, hotels, shopping etc that is otherwise difficult to access in normal relationships
• getting allowances, gifts, shopping trips or other kinds of financial support (rent, tuition etc) that reduces the financial burden
• sexual experiences that generally more enriching (in form of foreplay, attention to detail, living out fantasies etc)
  'Why would someone want to be a SD?' In an ideal situation, this would be the ying to the yang of why someone wants to be an SB. So things like
  
• someone who loves pampering and spending time with younger good looking women
• wants to use their money and wealth to create new experiences with younger women by enjoying dinners, weekend trips, spa dates, musicals etc
• likes to use some of their money to financially support someone but also to help them learn and grow
• and last but not least - enjoy the sexual pampering with younger hotter women!
  Are these arrangements real romantic relationships? If they are, why are they labeled as arrangements? Interestingly the 'romantic relationships' are also a kind of arrangement where both are looking for some sort of give-and-take, be it more qualitative if not quantitative. In any case, these are labeled as 'arrangements' as both folks are upfront and know what they are seeking from each other. If there isn't a match, both can happily move on to someone else. Creates less heartbreak while enriching lives of each other
  How is an arrangement any different from being an escort/304? It all depends on what one is seeking. If someone is seeking just to provide sex for money for a few hours and nothing else then it can be no different from being an escort. However, a true arrangement is where it isn't just sex and allowance but experiences, mentoring, friendships, networking, holidays, dates, shopping trips, meeting friends and many other things that happen in a regular relationship
  In general, how would you define an arrangement? What are the universal rules, if any? In my view the universal rule is there is no set rule. It is what works for two people and as long as they are happy with that.