For some gay men they tend to stick to a certain select few apps for finding partners such as Grindr, Scruff and Growlr. But sometimes gay men can be just complete drama queens. If you are looking for just sex then you don't want the headaches of someone liking you too much to the point where they start harassing you and even worse, stalking you. Sometimes when someone says they are looking for NSA they really want drama to the max and strings galore.
At least when it comes to bi guys or the so called married straight guys that want to experiment with men, you typically know what you are getting into. It is real NSA and typically the guys tend to be very discreet. So if you want drama free sex and without the strings or having to worry about someone obsessing about you 24/7 then you might want to look where you might find bi guys and straight guys.
One app that lets men be completely discreet about what they are doing is Blendr which is made by the makers of Grindr. The idea behind Blendr is to be a platform to allow men and women to search for whatever they want whether straight or gay whereas the gay apps imply it is gay.
If you are a straight guy looking for girls, the blendr app has tons of girls on it. The app uses the Badoo.com social network. You can read more on blendr or just find it in the app store or android play market.
Here many guys on the app list they are straight but send them a message, you will be surprised at how many write back flirting wanting to know how they can get with you.
If you are looking for real NSA whether looking for guys or girls you will want to join badoo or if you have a smart phone then get the Blendr app.