Brad Is Able to Maintain an Erection and Ejaculate During

Multiple Choice

Brad is able to maintain an erection and ejaculate during masturbation.Before his breakup with his previous partner,he was also able to maintain an erection and ejaculate during sex.He now has a new partner and has not been able to maintain an erection during sex.What is most likely the cause for his problem? 

A)  He may have caught an STI from his previous partner that is causing medical problems. 
B)  He may need to have his heart checked out because problems maintaining an erection are related to cardiovascular problems. 
C)  He may be experiencing performance fears with his new partner or comparing their encounters to his previous partner. 
D)  He may be experiencing that his penis is not the right size or shape in relation to his new partner's genitals and this is impacting his sexual satisfaction.