I do (I'm a guy), its the only way I can bust a nut. Is that normal?

Yes its very normal. Infact tensing up seems to play a major role in both male and female orgasms. I've known girls who could come just by lying still and tensing their lower muscles.

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i read this as: do you *check* your anus when you orgasm.

which gave me a funny visual.

sometimes i clench my anus when im not orgasming, but just casually for fun. is this normal?

I suppose that depends on how badly you have to shit. Or it could mean you have a healthy fascination with plugging something in there.

I may also be throwing out bullshit ideas at random. But it's up to you to decide that.

Really I just enjoy the clenching itself and nothing more. Not just with my anus, but everything I have that is capable of being clenched, flexed, gripped, tensed, etc. It makes me feel masculine to have a full body of parts able to project a state of unneeded and unexplained readiness not to mention feelings of insecurity and discomfort to potential threats from all sides and angles without having to re-adjust my position if the threat in question is approaching from an unorthodox position of their own, allowing me to save time which will be more efficiently utilized in out-manhood'ing the threat, enabling me to conclude the confrontation sooner with much higher odds at claiming victory, preserving as much hope as possible in attaining my goal of clenching my anus for orgasmal purposes by the days end like this topic here suggests is not only normal but actually an important part of the nut-busting process that a body-clenching manly man like myself ranks among the top of the list of priorities in personal goals of both the day-to-day type as well as the long term variety.

Some people say that's all just horse shit and I'm in a deep state of denial and really only clench my anus all the time because of my complete lack of friends and family members who willingly acknowledge our inescapable blood relations and that it is the only "activity" I am able to partake in due to the deep depression my poor status with my peers and family has induced and that, if thought is put into it, each clench symbolizes a clock ticking down to my inevitable suicide that the note will likely explain by placing the blame squarely on my infatuation with posting strange elaborate posts about my personal life and key parts of the inner workings of my core personality that overpowers my will to lead a fulfilling life. To those people I respond with a slow, drawn-out clench of my anus.

You are definitly a fag

No I don't.

I clench and then relax my PC muscles when I want to orgasm faster because my clitoris experiences different kinds of sensation depending on how my muscles are, so maybe it's something like that?

Maybe we could figure out the exact scientific explanation if we do a couple experiments together.