Despite the fact that a substantial minority of individuals describe s
exual thoughts that are perceived as unwanted and unacceptable, for th
e most part sexuality researchers have not differentiated sexual thoug
hts and fantasies that are perceived as positive by the respondent fro
m those which are perceived as negative. At the same time, cognitive-b
ehavioral researchers investigating intrusive thoughts-that is, unwant
ed, sudden, and involuntary ego-dystonic thoughts and obsessions-have
not distinguished those reflecting sexual themes from those reflecting
other themes. The purpose of this study was to examine sexual intrusi
ve thoughts in a nonclinical population. One hundred seventy-one colle
ge students participated in the study and were administered measures a
ssessing intrusive thoughts, psychological distress, and disposition t
owards sexuality. Sexual intrusive thoughts were reported by 84% of pa
rticipants. Compared to the women, the men reported a greater number o
f different sexual intrusive thoughts, and marginally more frequent se
xual intrusions. In addition, the men reported more frequent sexual in
trusive thoughts involving some active, aggressive themes and less fre
quent thoughts of being sexually victimized than did the women. Compar
ed to the men, the women reported less sexual arousal in response to t
heir most upsetting intrusive thought. Greater erotophilia, more frequ
ent sexual daydreaming, and more frequent obsessive thoughts uniquely
predicted the frequency of sexual intrusions. This indicates that sexu
al intrusive thoughts are not just a result of general psychopathology
or psychological distress, but also have a large sexual component. Tw
o patterns of experiencing sexual intrusions are delineated.