Some women worry if they do not always reach orgasm during intercourse, but approximately three quarters of women do not achieve orgasm through thrusting of the penis alone. The majority of women need steady clitoral stimulation for orgasm to occur, and many sexual positions do not provide this sufficiently on their own.
There are, however, approximately ten percent of women who are unable to reach orgasm despite being sufficiently aroused to have sex; this is called anorgasmia.
Some women enjoy sexual activity without reaching orgasm; anorgasmia is only a problem if the inability to orgasm results in dissatisfaction or unhappiness for the woman or her partner. Causes of anorgasmia can be the same as difficulties in arousal. Other factors can include sexual inexperience; difficulty losing control and performance anxiety.