She has not dealt with Andy in her mind adequately. She wants to go all the way, but her belief systems are preventing her going down that path.
She might benefit from "flirting with limits not to be broken", and this would allow her to not feel guilty - and to enjoy the company of other men without feeling like it was leading to adultery.
When Doctors were treating females for hysterical paroxysm in the 1880's, the Doctors would massage the genitalia of widows and virginal young girls until they reached orgasm. As the women were not being penetrated, it wasn't consider to be sexual, so it was entirely appropriate for a Doctor to massage a girl's clitoris. Eventually, however the doctor's fingers got tired. Hence the steam powered vibrator used to cure women of sexual tension causing them to act strangely and moodily. With the orgasmic release, the woman was magically cured and her husband gladly handed over the Doctor's fee for the special treatment.
A woman can only explore sex to the limit of her comfort zone, and to step outside this will cause her to feel very suspicious of why her husband wants to share her with other men. What is he secretly after, is he hiding some adulterous act?