Do breast implants sag quicker if they're placed over the muscle?

Dear mfourie51,
I almost always place implants submuscular. It lowers the rate of capsular contracture significantly. In addition, it looks much more natural because the muscle provides covering over the implant so its not as round on the top. I've also noticed the implants drop less over time when they are protected under the muscle.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

Yes. When implants are placed under the muscle, the muscle provides some support and thus reduces the tension on the breasts.