Hello, Thanks for writing to us. First time sexual intercourse may be painful due to intact hymen (a thin tissue membrane that partially blocks the vaginal opening) Or, you wasn t sufficiently aroused. When you will arouse or excite, the vaginal canal lengthens & expands so that your partner can enter his penis and you will produce vaginal lubrication (to prevent uncomfortable friction from thrusting). It is also possible that you were just nervous if it was first time sex which may cause your vaginal muscles to tighten, making penetration more difficult and painful. Steps to be done for easy and smooth sexual intercourse: 1) Next time, you must indulge in lots of foreplay to arouse yourself in top level to increase your vaginal lubrication before penetration. 2) You would be in more relaxed state and both of you will create a romantic environment so that you can focus and enjoy your sex. 3) It will also help if you add water-based lube (like KY gel or VAGISIL etc) to your vagina for easier penetration. Make it a part of preplay by having he lube you, then return the favor and ready to apply it on condom-covered erected penis right before he enters. 4) It s important that you must communicate to him what feels good and what doesn t. You can let him know what you need by saying like a little slower or harder or just like that and so on. 5) Also, you can try a woman-on-top position, which will put you in control of the depth and rhythm. Once you get used to the ins and outs of sex, it should be a lot more comfortable and fun. Last thing, if pain during sexual intercourse (termed as Dyspareunia) continues, you need to undergo some investigation under the guidance of Gynecologist to rule out pelvic organic disease like endometriosis, vaginal septa, hypoplasia of introitus, ovarian cyst, vaginal or pelvic infection etc. Hope, it helps for you. Good luck.