That's entirely up to you, and who YOU are.
If your relationship with your wife is fine, except for her disinterest in sexual experimentation, then ask yourself why sexual experimentation is important to YOU. Is it because you're just bored, and think something different would renew YOUR interest? Is it because you feel that her enthusiasm is lacking? Is it because you've started a porn habit? Or, is it because she's let herself go, while you've kept yourself up?
Is she has let herself go, aside from just stardard mileage(which none of us, male or female can help), then that can be a turnoff, as well as indicative of lack of interest on her part.
If it's just because you spend every waking hour together, and she's always up your ass, a decline in sexual attraction is understandable, and you might try arranging to spend a little less time together....in a non-offensive, NOT ”would you get the fuuck away from me, harpy!?" manner. See how that goes.
If you're watching porn, stop doing that, and work on turning her into YOUR pornstar, instead...not A pornstar(there's a big difference...figure it out).
If you think having an open relationship or bringing a third person into your bed is going to help, you're wrong. Put that **** out of your head. Immediately.
If you're convinced getting a secret(keyword) mistress is your key to personal happiness, how are your kids gonna take it, when THEY find out(when your wife finds out, your kids will find out)?
If you're still determined to go down the infidelity road(not a Marine, I assume?), how have YOU held up? Do you still get those looks from women? Do you still get women who shamelessly flirt with you, even while your wife is present, even though you wear a wedding band? If not, if you've let yourself go, even a little, why not START by rebuilding yourself into the best you you've EVER been? Say nothing to your wife about your new diet, exercise, grooming, and clothes; just do it, and let her wonder why. If she asks, just tell her you just want to be healthier, and to look better for her(give her a little wink on that last part, and then leave the room or change the subject...let her mind do they do).
By the time, or even before, you finish rebuilding the perfect beast, your wife may even surprise you, with renewed interest, enthusiasm, and a sense of adventure; if that's all you were really looking for, be happy.
If you start walking by mirrors and shop window, and say "whose that stud with wife," and things are still stale, and you're getting the attention you used to get(or never got) from random women....then you can start planning your adventure, Dudley.
PS - you might wanna be a little more careful who you share your thoughts with. What your buddies tell their wives, during pillow-talk, will almost certainly make its way back to your wife. Some guys have no self-control.