A total of 28% of women said they never make love, with the figure being highest in Scotland (38%) and lowest in the Midlands (32%).
Among those having sex, women without children said they had more orgasms, with 41% saying they orgasm most of the time.
The figure dropped to 12% of women with one child and 14% of those with two.
Most women said the daily grind of the office had an impact on their sex lives, with 67% of those working part time saying they had orgasms most or all of the time compared with 55% of women working full time.
The survey was released by Sky Real Lives to mark the launch of its new series, The Secret Guide To Women’s Health.