Hi there Mr Prasad. As i understand from your history your wife is 51 yrs old & menopausal (infer this from your statement that bleeding has stopped since 1 year!). In this scenario, you do not need to follow any contraception
anymore if indeed your history & is right & the gynecologist has even removed the Cu-T! So, if you feel uneasy using the condom, the good news is that you DONT HAVE TO!
Relax & enjoy your sex life. The fact that you still have the drive & desire as does your wife presumably, means all is well. You DONT need any medicaiton. However, if you so wish to do so, please consider sildenafil
or any other derivatives) after consultation with your GP/Physician/cardiologist to rule out any cardiac ailments or impediments to its usage!
Cheers & trust this answers both your queries...the Billings method is redundant in your case!
Wish you a safe & happy sex life & a long prosperous life!
Dr Praveen Rodrigues MD