Tapeworms and lice are examples of that can cause diseases in humans

Parasites.

Explanation:

Parasites are living things that derive from other organisms the resources necessary for their survival. They are considered aggressors because they harm the host organism through parasitism. An example of parasites are tapeworms and lice that seize the human organism and generate disastrous and uncomfortable consequences, often impairing some vital functions.

Tapeworms are large, flat worms that live in the intestinal tract of some animals. These are transmitted to humans who consume food or water contaminated with tapeworm larvae or eggs. Infection with this worm causes nausea, weakness, diarrhea, fatigue, weight loss and so on.

The louse, in turn, is an insect that feeds on people's blood and reproduces quickly. Transmitted from one person to another, it settles in the hair follicle, ie at the base of the hair, where it lays its eggs - the nits - which are easy to recognize and which differ from dandruff because they stick to the hair.

you can't get pregnant from swallowing semen; the taste varies

explanation:

when you swallow semen it doesn't go into the vagina and fertilize the egg; for taste how ever that can be altered by what the man eats suck as pineapple can make it sweeter

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