ent ▁sexual ▁activity . ▁Sex ual ▁ar ous al ▁may ▁be ▁assist ed ▁by ▁a ▁rom antic ▁setting , ▁music ▁or ▁other ▁so othing ▁situation . ▁The ▁potential ▁stim uli ▁for ▁sexual ▁ar ous al ▁vary ▁from ▁person ▁to ▁person , ▁and ▁from ▁one ▁time ▁to ▁another , ▁as ▁does ▁the ▁level ▁of ▁ar ous al . ▁ ▁Stim uli ▁can ▁be ▁class ified ▁according ▁to ▁the ▁sense ▁involved : ▁som atos ens ory ▁( touch ), ▁visual , ▁and ▁ol factory ▁( sc ent ). ▁Aud itory ▁stim uli ▁are ▁also ▁possible , ▁though ▁they ▁are ▁generally ▁considered ▁secondary ▁in ▁role ▁to ▁the ▁other ▁three . ▁E rot ic ▁stim uli ▁which ▁can ▁result ▁in ▁sexual ▁ar ous al ▁can ▁include ▁conversation , ▁reading , ▁films ▁or ▁images , ▁or ▁a ▁sm ell ▁or ▁setting , ▁any ▁of ▁which ▁can ▁generate ▁er otic ▁thoughts ▁and ▁mem ories ▁in ▁a ▁person . ▁Given ▁the ▁right ▁context , ▁these ▁may ▁lead ▁to ▁the ▁person ▁des iring ▁physical ▁contact , ▁including ▁kiss ing , ▁c ud d ling , ▁and ▁pet ting ▁of ▁an ▁er ogen ous ▁zone . ▁This ▁may ▁in ▁turn ▁make ▁the ▁person ▁desire ▁direct ▁sexual ▁stim ulation ▁of ▁the ▁bre asts , ▁ni pp les , ▁but to cks ▁and / or ▁gen it als , ▁and ▁further ▁sexual ▁activity . ▁ ▁E rot ic ▁stim uli ▁may ▁origin ate ▁from ▁a ▁source ▁un related ▁to ▁the ▁object ▁of ▁subsequent ▁sexual ▁interest . ▁For ▁example , ▁many ▁people ▁may ▁find ▁n