Orgies:
Ddefined as anything involving a five-some or more, this is an integral part of the world of swinging. Three-way and four-some action is considered "straight" by enthusiasts. There are several standard orgy fantasies, including: slaves; Egypt sex; barrooms; mountain cabins; yachts, and classrooms.
Pantyhose/Legs/Heels:
In contexts other than panty/upskirts, this involves a glorification and/or worship of femininity in the form of women's clothing, or in the case of legs, of the women themselves. Although interests vary by sexual orientation, this is mostly a hetero fetish involving solo or group sex with at least one of the partners dressed in garter belts, pantyhose, high heels, and sometimes gloves (as in the outfits of most porn stars). There's some, but not all that much, preference attached to the material the clothing is made out of.
Pissing/Scat/Vomit:
Mostly guy-on-girl and sometimes associated with preggie and upskirt fetishes, watersports is probably the broader term and urine fetish is perhaps a better name for the variety of interests in this area, including holding it in when you have to go, watching someone go, peeing on someone, and drinking it. Scat play, which involves feces and sometimes vomit, is perhaps based on the idea that the more obscene the better. In the BDSM world, "toilet servitude" refers to handling feces or being defecated on. In the scat world, shit eating or smearing it all around the body is seen as erotic.
Pregnant/Lactating:
A preference for "preggies" is usually associated with an interest in hardcore sex, but is also a fulfilling part of romantic straight sex and/or fascination with the female form (belly and breasts). Oral/anal sex is common, lactating breasts are sucked, stroked, and pinched, and there's pregnant sex slave and other fantasies. Not necessarily related is the "fat chick" fetish.