MANILA, Philippines—What men need to "keep it up" is not popular erection medicine Viagra or any other sexual enhancers.

Vegetables, surprisingly, can prevent or even reduce chances of having erectile dysfunction (ED), the People for the Ethical Treatment of Animals (PETA) said Wednesday.

Health websites described ED, sometimes called "impotence," as the repeated "inability to get or keep an erection firm enough for sexual intercourse" or the lack of sexual desire and problems with attaining orgasm.

Citing data from the Erectile Dysfunction Institute, PETA said science has proven that eating more vegetables or those rich in fiber lessens chances for ED as almost 90 percent of those afflicted had physical imbalance and poor diet.

Improper eating habits -- including eating too much fat, or poor gaining diabetes, prostate cancer and inflammation -- could also lead to impotence.

PETA said vegetables also help remove "plaque from arterial walls" caused by fatty food, and eventually prevents ED from happening. The result? A happier sex life.

Actress and FHM cover girl Alicia Mayer, a PETA-Asia Pacific advocate, attests to this and even posed to promote vegetarianism and combat animal cruelty.

In a very sexy pin-up, Mayer challenged men to "get it up" only by going vegan.

“Maaring tumagal kayo ng isang gabi sa tulong ng viagra, ngunit mapapatagal kayo habang buhay ng pagiging vegetarian,” said Mayer.

Mayer said the cholesterol accumulated from oily food processed from animals only prevents proper blood circulation, which could lead not only to impotence but various heart ailments.