For those that know and have lived in a successful tourist beach town, Las Terrenas, which is home to a large number of expatriates, mainly Europeans, you will know that especially during weekdays, the main nightlife is restaurants and very few bars stay open late (midnight) in the central tourist part of town. Essentially you have La Bodega, which is a dance hall, and a few small often sparsely populated bars and that is it. Further inland there are a few other drinking/dancing establishments but are mainly frequented by locals and at weekends the two discos near the Fisherman's Village stay open to the early hours.
This model for a small tourist resort, which is full in season and at just about every weekend with visitors from the capital, does work, albeit some of the business community would wish for even better visitor numbers in the off season. It is a fun successful holiday destination for a broad range of visitors. Bar businesses tend to struggle though.
For those that have enquiring minds, it is not difficult to find an accomplice with whom to enjoy some of your vacation , if that is what your holiday plans entail, and you don't get hassled day or night by sex workers even in the dance hall mentioned nor does one see much drunkenness.
Tell me why Sosua cannot adapt to the models of Las Terrenas or indeed Cabarete? You need the middle class Dominicans to come at weekends for sure.