The category of fetishes is both huge and varied, it can encompass anything seen as being outside the culturally established norms of sexual relations and contact. Seriously anything, from the somewhat common foot fetish, to the more obscure fetishes dealing with specific objects or places. There is no harm in most fetishes, in fact most of the harm people do to them selves revolves around them trying to deny their desires and thus turning them in to something unhealthy. While having a sexual fixation on ladies underpants may not make you a star in the bedroom it does not really hurt anyone, however when the desire is denies there is a chance (albeit small) that the fixation can turn to anger and hatred, and no one wants that. The more likely outcome of denying a fetish is lack of sexual motivation and performance. The results of denying ones sexual gratification from say a shoe, are like a gay man attempting to sleep with a woman. It's still physically possible, but because it's not really what they want no pleasure is derived, thus the equipment might not work.
The best way to deal with more obscure fetishes is to find an understanding partner who is willing to incorporate it in to your love life. Finding this understanding person however can be a nightmare. If you are not looking for a long term relationship, then perhaps an Internet dating site would be appropriate. You would be surprised how many people are out there that share the same fetish as you, trust me even if you are in to Swiss cheese, your not alone. Aside from Internet dating sites, you can also check out local news papers. They tend to have an assortment of personals pages, and if your city has in independent newspaper, even better; independent papers tend to have a more eclectic reader base, and the likelihood of you finding someone to tickle your freak button increases.
If you are looking for a long term relationship you have a rough road ahead of you. There are basically two different paths to take, and I recommend both. Firstly, if you are already doing the Internet and newspaper personals there is a chance that the people you are hooking up with are interested in a long term relationship also. Don't force the issue, but approach it casually, ask them if they would be interested in seeing you again, if they are try to ask them out for coffee after a few romp sessions. You never know what can happen.
The other alternative, is try to date someone who does not know anything about your fetish, and slowly introduce them to the idea, this is best done after a night of light drinking so inhibitions are lowered. You are not going to want to wait too long in to the relationship to delicately announce your desires however, as there is no use wasting time on someone who will never be able to please you in the bedroom, so tackle the issue sooner rather then later.