My take is that you should try various variants.
Come to Brazil and see how you like the women here - there are numerous variations here. A friend of mine prefers new girls every night, and have been with 3 000 in 9 years - yes, it means that there is not only one at a time. Also, age difference is a little more liberal here - so you can keep feeling in your twenties for a really long time. Just be careful with your health...
As for looks - around 7 million in Brazil have a background from Lebanon, 25 million from Italy, more than 2 million from Japan and then a whole range of Dutch, German, Spanish, native Indian, African and so on, with a lot of mixes... and they all have mostly Brazilian "attitudes", which are very liberal and exploring.
It is quite common to have had at least around 100 partners as a guy here, and in a Durex world wide survey a few years ago, Brazil came out second in the world in frequency of relations - while Greece was in first place... But Greece is like a small state here in Brazil, so...
In terms of economy - yes, many girls can be much cheaper than a few girls. I have been living in long term relationships for 14 years and that beats going with 10 girls in one week. So in the end quality trumps quantity - and when it comes to quality moves, Brazil is quite on another planet.
As one gets older, more areas of the brain is developed and "opinions get rounder" with considering other people's viewpoints as well as being more moderate and conservative. There are other changes, like when you become a parent, your brain changes as well; chemical and hormone processes.
Here are some intelligent takes on finding good relationships:
http://www.personalitypage.com/relationships.html