Douche

Are we talking anal or vaginal ?

If it's pleasurable is a matter of taste - but it's usually not necessary, even for anal sex. There's a lot of good information on the subjects that address many issues.

Uh no...not needed at all...get a good shower massager.

Vaginal douching can cause problems. It's really not necessary and it can cause your vaginal bacteria to be imbalanced, causing Bacterial Vaginosis or yeast infections, etc. If it's for anal cleansing, that's a different story and I can't answer much about that.