Servers which exmasters provides are characterised with stability, reliability, high performance and uptime. That's why I consider you will not face any issues using their dedicated server which are supported for 24 hours.
There are thousands of web hosting companies out there, but only a few dozen are true hosting companies like Bodhost.com. You will find a comprehensive range of dedicated server hosting solutions offered by this decent host.
It provides great network uptime, so your sites will be always up.
Well knowing exmasters.com as the quality and professional host, I may sduppose this company could be a reasonable choise, especially if the adult content is going to be hosted.
Alternatively I may recommend you considering webhostingbuzz.com as this company is also offers quality metered servers where stable business feels good. Adult content is also not restricted unless it is illegal.