Loneliness in postdoc positions

I am 25 years old, and in a few months' time I will have to decide whether to get a job in London or apply for a postdoc somewhere.

Apart from all of the usual pros and cons (eg. job security, salary, lifestyle) associated to each path, one thing that worries me most is my loneliness. I am worried that if I were to get a postdoc (say at some small university in some small city), that I would never meet someone to date and get married to eventually. Most math postdocs tend to be male (I believe) which is fine for me since I am gay. But it seems to me more likely that I will find true love taking a city job in a metropolitan environment where there are many more people. And I am really not sure that the "single life" is amenable for doing a postdoc in a foreign country (where I'll likely have to look to find a postdoc in my field).

I apologise if this thread is not suitable for this board, but it is an important consideration in a potential academic's life. I would truly appreciate your thoughts and experiences.