VincentValentine

Upon meeting my gf, i have an erection straight away and we usually end up kissing and just hugging for hours. However when we move onto sex, i can't seem to get an erection. Later on the way home my penis begins to ache. What should i do? Do i initiate sex earlier? Or is there a method to hold my erection longer/to not get an erection until we start sex? Thanx in advance