Glamour models focuses on sexuality so there are no requirements to be a glamour model other than the ability to pose seductively. 
Euphemistic is a woman who models topless or nude for photographs.
For glamour models right body shape and size is directly related to success. This is particularly true of the female breast, where having their size and shape altered by breast implants is considered crucial for success in the glamour industry.
The market for glamour modelling established mainly with Playboy in 1953 (today more in PlayboyPlus) and The Sun’s Page 3 in 1969, a section in their newspaper which now features topless British models.
For the most part, glamour models are modelling in calendars and men’s magazines, such as Playboy, Maxim, FHM. However, some popular models transition into commercial print modelling, appearing in swimwear, bikini and lingerie photo shoots.