I am 44 yrs old & our sex life is good. In recent times I am using different types of condoms to develop interest in our sex life. As my self & my wife want to enjoy more by delaying ejaculation, sometimes I am using xtra time condoms but due to the xtra time my energy is getting exausted before ejaculation though we are really enjoying the extra time while having sex. Please advise how to keep-up the energy level till the ejaculation.