A small town is generally much worse for getting laid than a big city. Also depends on your country/culture, because in many places cold approaching is not accepted (like my own small home town), so social circle is the only possible way to get laid, and most of the people are not even into serial dating but marry their first love.
If you find yourself in a small town like mine and don't have a social circle with doable single girls in it then you're probably in for a long dry spell. The only way you can do good here is if you have a good/large social circle with doable women in it, or an indirect way to make acquaintances with many women (like working in a bar or something).
And even then if you try to have girls on rotation or change girlfriends too often, people will very soon learn of you and the majority of the girls will not consider you an acceptable boyfriend and you won't be able to get them.
If you find yourself in a small town like mine and don't have a social circle with doable single girls in it then you're probably in for a long dry spell. The only way you can do good here is if you have a good/large social circle with doable women in it, or an indirect way to make acquaintances with many women (like working in a bar or something).
And even then if you try to have girls on rotation or change girlfriends too often, people will very soon learn of you and the majority of the girls will not consider you an acceptable boyfriend and you won't be able to get them.