The book deals with the affection of a middle-aged man for a very young woman, resulting in a mutually parasitic relationship.

A parasitic relationship is one in which one member of the association benefits while the other is harmed.

Such effects are most severe in mutualistic and parasitic relationships.

As with real life viruses, they need other creatures to survive through a parasitic or carnivorous relationship.

Video games have always had a parasitic relationship with television.

We now have enough information on both life-forms to know that a symbiotic or parasitic relationship is impossible.

Many insects have a parasitic relationship with humans such as the mosquito.

A parasitic relationship is the opposite of a mutualistic relationship.

The fossil shows that this type of fungal parasitic relationship had been established by the Albian, 100 million years ago.