If you're saying "Not tonight" a lot, it's to investigate your surroundings.

Feeling a little lackluster in the libido department this Valentine's Day? You're not alone. Americans' sex drives are plummeting, thanks to many chemicals and ingredients added to our food, medicines, shower gels, and even sex toys! Get your hormones back on track and rev up your sex drive by eliminating the top sex-drive killers that lurk in your home.

Soda
Have you heard the gross fact about many sodas? Some, like Mountain Dew, list brominated vegetable oil—or BVO—as an ingredient. Bromine products are linked to male infertility, impotence, and decreased libido.

For that same reason, it's also a good idea to avoid other sources of brominated flame retardants, including one found in some carpet padding. That means wet-mopping and vacuuming with a HEPA-filter-enabled vacuum cleaner often so flame retardants don't accumulate in your household dust.

Fish
Industrial waste chemicals that build up in fish, dairy, and meat products could be erasing sex drive in women, according to Michigan State University researchers. Although banned in this country, hormone-mimicking polychlorinated biphenyls, or PCBs, can remain in the environment for decades.

To protect yourself, eat lower on the food chain, try Meatless Monday dinners to cut back on meat consumption, and choose fish from the safe fish list, which are low in contaminants. Definitely avoid the 12 fish you should never eat.

Cash-register receipts
About 40 percent of receipts today are coated with the hormone-disrupting chemical bisphenol A (BPA), which has been linked to fertility problems and heart disease. A recent study published in the journal Fertility and Sterility discovered that men with higher BPA levels in their urine experienced low sperm counts and lower sperm quality than men with lower levels. To keep your sperm—and sex drive—levels healthy, turn down unnecessary receipts and avoid another huge source of BPA, canned foods, including soup.

Soy
A Harvard study published in the journal Human Reproduction found a strong association between men's consumption of soy foods and decreased sperm counts. In the study, men who ate a variety of soy-containing foods and then underwent semen analysis had poor sperm quality. Animal studies also found connections between males chowing down on soy and erectile dysfunction. Since genetically engineered soy is found in the majority of processed foods, eat non-soy-containing foods made with whole ingredients as much as possible.

Sex Toys
Certain sex toys and other vinyl-containing products can harm both male and female libidos. The chemicals in vinyl products—everything from that plastic vibrator to your shower curtain—can disrupt hormones and lower testosterone, killing the urge to have sex in both men and women. Look for glass or medical-grade silicone vibrators, not vinyl ones, to heat up your foreplay without slowing your desire.