Depends on how much you do already and what you are exercising for, but the usual recommendation is at least half an hour every day. If you exercise every day, remember to give yourself days off to recover.
It upsets me a bit that you need sex to find out 'who you are'. You are more than just your sexual organs or preferences.
However, to answer your question there are lots of online sex contacts sites. Try registering on one and see what kind of offers you get.
My man was overseas for three tours with the military in the first couple of years we were together. In fact the first year we were together I saw him for exactly a third of the year! I was really hard to be without him all that time and I missed him like crazy but I was never unfaithful to him...