Me and my girlfriend are having problems, help?z

okay ill start with the story me and my girlfriend have been going out about 13-14 months we dident decide to have sex until bout 9 motnhs she was a virgin i wasent we always had good sex adventurous ect until about a month ago. she says bout 5 mins into sex it starts to hurt her so we have to stop. when we are having sex and she says it starts to hurt i do notice it is harder for me to actually get my penis in so thats why i have to stop. now we love each other so much we have never cheated on each other i never pressured her into anything it has always been mutual. but i just dont understand why we cant have sex like we used to. so i hope someone can help us?

Foreplay?

ok i have a simple explination for you, your starting sex to early without enough foreplay, in my experiance after a while in a relation ship the excitment of just having sex is no longer enough to get a woman properly prepaird while guys still get fully aroused. this leads to her being dryer and tighter than she has been in the past which will cause you problems getting your penis in and will hurt her.

what i would suggest is you spend more time on foreplay before having sex, not just oral sex etc but more sensual loving things aswell, give her a gentel back massarge, hug her and strock her body, things like that, these kinda things may not do much for you but she will like them, and you say you love her so should have no problem doing them. just make sure she is nice and wetdown there before you start actualy having sex with her.