People may be attracted to the swinging websites due different reasons. Many couples looking for threesome and find the thought of having sex with other people to be very arousing, and may find that swinging becomes a catalyst for improving their own sex lives and relationship. Some people may feel stifled by repressive societal attitudes towards sexuality, and may welcome the opportunity to form friendships and a new social network with people of like mind. Others may simply feel that sex should be a natural possibility in any friendship in which there is mutual attraction, and so appreciate the relative open-mindedness and pleasure-positivity with which the swinging community views this subject. Although the swinging community is unfortunately not always the best place right now for het-identified men to explore their potential bisexuality, it is currently a relatively good place for het-identified women to initially explore sex with other women, and this sometimes plays a role in couples choosing to seek it out.
In the past, the swinging community has been somewhat unaware of or confused by alternative sexual practices such as BDSM or Tantra. This appears to be changing, and these days you may find many folks in the swinging community who are knowledgeable about such things (though forms of BDSM much more extreme than spanking or very light bondage may make people uncomfortable, depending on the club). If you're interested in doing so and spend enough time meeting different people, you may actually find that today's swinging community is becoming a somewhat fertile place to meet folks with a variety of sexual interests. It is certainly true right now that the national swinging conventions tend to host seminars and workshops on a variety of sexual topics, which seems at least somewhat indicative of broadening perspectives in the community.
Some women may find the swinging community to be a welcome dose of sanity. Our culture can be quite cruel to women who have an active interest in sex, often derisively labeling them "sluts" - a term which stands in sharp contrast to the less derogatory term for men, "studs". The swinging community may be especially attractive to these women, who may feel their sex drives and/or sexual assertiveness should be appreciated rather than snickered about or reviled.
Some people end up learning quite a bit about themselves and their bisexuality through swinging. For example, most folks find that having their partner actively enjoy and appreciate what they are experiencing during sex to be a tremendous turn-on; this is a realization which may stand in sharp contrast to the attitude that "performance" is all-important. Swinging can be an opportunity to learn to relax and appreciate sexual pleasure, and may help one view sex more as a source of pleasure and intimacy and less as a social bargaining chip or ego fuel.
Although this may vary slightly from club to club, in general the swinging community is quite accepting of a variety of body types, sizes, ages, and shapes. Additionally, many on-premises events provide an opportunity to dress sexily or go completely nude, which can be a fun and sensual experience in and of itself.
What might you dislike about swinging?
If you are uncomfortable with people being sexually attracted to you and/or flirting with you, then you might be uncomfortable at swinging events; similarly, if your relationship with your partner is on shaky ground, you might find seeing him or her flirt or be flirted with to be an uncomfortable experience. If either of you have hidden agendas concerning finding a permanent "replacement" for each other, you're probably in for a major emotional disaster. If you and your partner cannot communicate directly about relationships and sex, you're probably eventually in for a similarly-sized disaster. In general, sex can provoke strong feelings along with its many pleasures; if you aren't comfortable dealing with emotions, then perhaps it might be better to wait a little while before exploring "the swinger lifestyle."
If you are bothered by seeing people have sex without condoms, then you might want to avoid some of the larger play areas in many on-premises swinger's events. Although I have never run into a situation in the swinging community where my requests to use latex were looked down on in any way, it is certainly true that not all on-premises clubs require the use of safer sex precautions. Depending on your experience with sex-positive communities other than swinging, seeing others not use latex may be unsettling to you. You should know what your own standards are with regard to safer sex, and be willing to articulate them to new people or couples you are about to have sex with. If your personal safer sex standards include using barriers for cunnilingus, then you should be prepared to do some explaining as not everyone will be familiar with this practice.
If you are offended by phobia against bisexual men, then you should be prepared to either look for a club that is more open-minded on this particular issue, wait for attitudes in the community to change, or else attend anyway and make a point of not letting small-minded comments go unchallenged.
If you are a single male, you might actually be better off waiting until you are in a suitable relationship before attempting to become active in swinging - most swing clubs allow few if any single men to attend their events.