"I have been to the DR many times, and why is it that you rarely see dominican men and women together, especially those of the younger generation?" Emma
Emma, you don't see dominican couples more often because most foreigners come to DR on short vacations and stay in resorts, however, when they do some here to stay they tend to settle down in expat communities. Ex: in costambar you would only see expats and the dominicans who live there are either married to expats or work for them. There is absolutely no contact between the dominicans and foreigners other than the mentioned case.
If you come to santiago, moca, la vega etc you will only see dominicans with dominicans and hardly any presence of foreigners. Most girls from lower-end socio-economical ladder would prefer a foreigner over a dominican (of the same socio-economical level) but the upper middle to upper socio-economical level would only prefer dominicans. They will almost never consider a tourist gringo over a dominican male or female. Those dominicans tend to stay among their own society and would only consider a gringo for marriage if that foreigner is living / working here and knows the dominican cunture well. In other words, a gringo who has been converted to a dominican.
These dominicans only come in close contact with foreigners when they (themselves) are vacationing in the same resorts as the foreigners; then again, they don't talk to any foreigners. For that reason, you will rarely see a white well-to-do dominican with a white foreign lady. They almost always go as couples. Oh wait, i know you will say "wait AZB, i have seen some dominicans with white women..." guess what, those blond girls are also dominicans.
For the same reason you will only see white foreign women or men with only black dominicans. The whiter upper crust of the dominican society never mingles with white foreigners or black dominicans. Thus the two are left for each other.
So when you want to learn about where the true dominicans are, come to cibao.
have a nice day.