Also, Cavanah says female customers have complained that water-based lubes containing glycerin seem to promote vaginal yeast infections -- the idea being that glycerin, a sugar, feeds the yeast naturally present in the vagina.
This notion has spread widely around the Internet, but there's scant scientific evidence to support it.
Tucked away in New York's Lower East Side, among a jumble of old tenement buildings crisscrossed with iron fire escapes, is a boutique called Toys in Babeland.
The storefront doesn't scream "sex shop" to passers-by, but it's a famous emporium of sexual aids.
One other important warning applies to sex lubes: Avoid anything that contains the spermacide nonoxynol-9.