Watersports
Not unless the fetish becomes more important than your partner.
Not necessarily. The question is, are you in control of the fetish, or does it control you? If it controls you -- that is, if you find that it interferes with your normal daily activities and relationships with others -- you should talk to a mental health professional. You should also seek counseling if your fetish involves an unwilling or underage partner (rape fantasies, for example).
Maybe he has a foot fetish
A foot fetish is considered a paraphilia rather than deviant sexual behavior, as long as it only involves consensual acts and does not harm others. It becomes deviant if it causes distress, involves non-consensual acts, or interferes with daily functioning.
A foot fetish.
An earlobe fetish.
blowphillia
A fetish is when you need a certain thing present in activity to orgasm. A fart fetish would be when someone needs their partner, or themself, to fart in order to orgasm.
Schediaphilia, is the word for that fetish. It is also know as toonophilia.
Very carefully. This is not a fetish many people are accepting of. Perhaps you should discuss this with a counselor for advice on how and when to tell your partner.
No one can say why for sure as with any other fetish, it's so weird it's called a fetish
if that's what you like and its not hurting anyone than go for it , but try to find an open minded partner first!