In ancient days, probably. Given the increased presence of estrogen and other female hormones in our meat and dairy sources, it is probably the opposite now. Also keep in mind that 90% of people who eat meat now eat "lean cuts" of meat, and very rarely eat animal organs (heart, liver, brain, etc), which are the parts that really boost testosterone levels.
"The study measured testosterone levels in 696 Oxford University men. Of the study participants, 233 were vegan (ate no animal products) and 237 were vegetarian (ate milk and dairy products). The remaining 237 subjects were men who ate meat on most days of the week...vegans had higher testosterone levels than vegetarians and meat eaters."
Whether you're a vegetarian, fruitarian, frugavore or vegan, you still have something in common with meat eaters. That is the ability to lift weights. Heavy lifting can help boost testosterone levels. The best exercises to do are multi joint routines such as bench presses, deadlifts, military presses and squats.
Testosterone is produced in the testes of the male. Essential fatty acids aid in the production of testosterone. For that reason, there are some sources of essential fatty acids that vegetarians use to promote this process. Some examples are flax seed oil, hemp oil and olive oil.
Eating pumpkin seeds offers a few benefits to the vegetarian. They contain a lot of vitamins that help boost libido. Some of these include vitamin K, D, C, E and the B vitamins. The zinc helps testosterone. This prevents low testosterone levels.
Some vegetarians allow eggs in their diets. They're a good source of protein--which helps increase testosterone--and they're also a source of B-5 and B-6, which are stress-relieving vitamins. They also keep testosterone levels steady in the body.
Fruits, Vegetables and Nuts
Many different sources of nuts and vegetables are used by vegetarians to increase testosterone levels. These include celery, bananas, cabbage, spinach, avocados, almonds, and cruciferous vegetables including cauliflower, cabbage, Brussels sprouts and broccoli.