Do mail gupys hit a female under the belly when they breed?

No, male guppies do not hit females under the belly when breeding. Instead, the male guppy uses his gonopodium, a modified anal fin, to inseminate the female. During breeding, the male guppy positions himself alongside the female and inserts his gonopodium into her anal opening, transferring sperm to fertilize her eggs. There is no hitting involved in the breeding process.