Do vegetarians taste better in bed?

Yes

Scientific studies have found when performing oral sex there are certain foods that can enhance and sweeten semen/ejaculate while others can deteriorate the flavor.

Foods that make semen taste gross include:

processed meat

Asparagus, chicken, garlic, onions, dairy products, broccoli, cauliflower, brussel sprouts, greasy food, spices, coffee and maybe even chocolate

Foods that make semen taste good:

FRUIT

Plums, mangoes, pineapples, nectarines, oranges, lemons, limes, parsley, coriander, spearmint, peppermint, grapefruit and green tea, honey, apples