Yeah, sperm does taste different. Many factors affect it, the main one being nutrition. I know to make sperm sweeter you should eat more often mangoes, pineapples, kiwi, apples, pears, melons, white meat. And some spices can also add sweetness to sperm - cinnamon, parsley, dill, cardamom. If you're interested in learning more,
https://www.yourpleasuretoys.com/ has many useful articles, not only on this topic.