I got married before 10 days. We both are virgin. I have problem in inserting penis in my wife's vagina. My penis is perfectly erected and so is perfectly excited. Also many times When I wear condoms my erection starts decreasing. I think when I don't wear condom my penis remains erected. I tried inserting in vagina when my penis is perfectly erected. But I don't make out what is our mistake though we both are perfect. So kindly help me.