Your question is actually a very good one, and believe it or not, you are not alone in asking it as it is also very common. I would like to add not only sports activities, but compression from mammograms and trauma from car accidents to your concerns about rough sex and tight tops causing damage to breast implants. First, I should say all breast implants, saline and silicone gel, are pretty durable and are tested to strengths that generally exceed what a woman's breasts would normally need. I routinely twist the implants, mash them, and even throw them on the floor during consultations to demonstrate how strong they are for potential patients. I think you would likely have significant injury to your ribs and soft tissues way before you sustained any injury to your implants from direct trauma from any of those things listed above. Having said that, I will also point out that it is pretty widely accepted, based upon statistical analysis, that silicone gel implants rupture with about half the frequency of saline implants. I think this is due in large part to the mechanical differences between the gel as a fill material and saline as a fill material. The gel is much softer and more compliant, and perhaps more importantly, the relationship between the gel and the rubber shell of the implant is MUCH different between the two. Thus, the rubber shell, while made of the exact same thing for both saline and silicone gel filled implants, is able to withstand forces and tearing strains MUCH better when filled with gel versus saline, just because of the difference in the fill material and how it relates mechanically to the shell. Add to this the fact that there are now 3 different companies in the US approved by the FDA to sell silicone gel implants, and they each have slightly different gels and slightly different shell properties, with different ways that the shell and the gel interact. Thus, the feel of the implants from different manufacturers may be different for different patients, and the performance of the implants with regard to things like rupture, gel fracture, and rippling may also be different. These things are actually pretty well studied and worked out in reproducible laboratory evaluations with published data. I personally use implants from all of the different companies, because I think they all have their strengths and weaknesses, and sometimes one implant works great for one patient's needs while another works better for another patient. I rarely use saline implants anymore because they just don't seem to meet the needs of my patients on a number of accounts. The best thing for you to do is to find a board certified plastic surgeon who has a lot of experience with all of the different types of implants and have a consultation so that you can find out what specific implants will best meet your individual needs. Good luck.