Because the rings will auto-Jelq you (in other words, they focus blood flow\pressure in the organ without the required involvement of your hands), you can actually be auto-Jelqing your dick and having sex or masturbating at the same time. Obviously this is not possible with traditional Jelq movements that require both your hands to be fully occupied with various OK grips on your penis to manually control the blood flow.
This brings us to penis clamping, which is basically a strong persistent Jelq applied to an erect penis, that completely seals the erection so that blood can NOT flow out of the male organ until the clamp is removed. These rings can accomplish this. These rings are meant to be stacked together, each one applying a little more pressure, they combine to produce very powerful flow control in the organ, and at some point (usually between 4 and 7 rings, depending on the guy) a clamping effect is accomplished... which is to say, an erection under the influence of the rings will be super engorged (huge) and will last as long as the rings are worn. To be noted a full clamp should not be maintained without your penis taking a breathing break for more than 15 minutes. The definition of a break is the full removal of the rings for at least 5 minutes. Getting a super erection doesn't really take a full clamp for most guys, I.E. the erection will seem unstoppable and un-loseable even at lower pressures (fewer stacked rings) before it truly is fully clamped. However, as you can imagine, for men with persistent erectile dysfunction (especially difficulties with the maintenance of a hard cock) a complete penis clamp option equals 15 minutes of hard pounding sex they would not otherwise be able to have.
According to Sex Therapists very few people have intercourse that goes longer than 12 minutes (when we say intercourse we are not including foreplay, rather only actual penetrative sexual thrusting of the penis inside the vagina or other orifice). So based on this it should be easy to safely mix sex and clamping. But these rings, like many of our rings, will also allow men to last longer than normal so be conscious of time if you are mixing sex and clamping. Sexual movement does promote a far greater amount of natural circulation than standing in front of your bathroom mirror and doing your Penis Enlargement (PE) exercises. That said, the 15 minute rule does still apply.
Of course many guys are going to make up their own rules as they go, but do at least adhere to the guidelines for the first 2 weeks to get your body acclimated to the pressure the rings produce, and then, if you must, increase the time spans by only a minute at a time in a given day, see how your penis responds and go from there. The most likely way to injure yourself with Penis Enlargement is by trying to rush your results, slow and steady is always the best approach. And really, outside of intercourse, we can see no reason why a man would not want to give his penis a rest every 15 minutes, the concept is just like working your muscles in the gym for a series of reps and then taking a short rest before starting another set.