Despite using lots of lubricant my hubby is still unable to penetrate into my vagina and slip out very often. I also felt pain during the process. Any advice?

Hormonal changes can cause vaginal dryness, especially a dip in estrogen which happens after childbirth, during breastfeeding and when you reach menopause. The vagina needs estrogen so talk toa doctor about estrogen therapy. Not enough arousal also causes pain during sex since the vagina is not titillated enough. Try oral sex or hand stimulation until you come? That should help, I hope.