hello Matt. what great synchronicity, this is what i've been thinking of lately too. well, since this is not the spirituality forum, i will not get too much of that babble here but i do recommend meditation if it feels right to you.

what i'd like you to ask yourself is why do you feel the need to have sex? what are your thoughts based on when you want to have sex?

is it out of attraction towards your wife? something she does? external stimuli (pornography? something on the TV? the media is sooo sexualized nowadays, it's like they're trying to deliberately make us have sex rofl)?

as to your question, i don't know of a pill that's 100% safe and natural that would take away your sex drive - it's a natural thing after all and exists for a reason. since you have considered meditation, i would suggest studying chakras and finding out what sort of things balance the chakras that have to do with sexuality. also, it would be good if your wife did some of this studying and tried some of the things (ie. aromatherapy). also ask herself why does she not want to have sex?

it always takes 2 for tango.

i guess i infused some of the spirituality stuff here even though i tried to avoid it, sorry about that. my point was to get you to discuss this matter with your wife, after doing research and look at your sex life and your needs from a new point of view. there are answers for those who seek and often they are ones you find yourself.

good luck!