is he able to go without any type of sexual activity for a day or two? does he feel the need to have sex with you or masturbate alone on a daily basis?
Sexual addiction can manifest in many ways. It could be to pornography, talking about sexual acts and thoughts on a regular basis especially in settings inappropriate to the topic, wanting sex as much as possible foregoing regular daily activities to satisfy the desire, etc.
Like any addiction, a person wants to fill an empty void with something that either brings pleasure or comforts/blocks out pain or negative feelings and emotions. With sex addiction, I was trying to solve my loneliness, frustration, and depression by going into the depths of online pornography, chat rooms, etc. I would wake up in the morning and go online for a few hours to look/watch and go into seedy, scummy chat rooms. I would pass up food just because i felt the need to satisfy my desires. Before I knew it, it was early afternoon and I'd only have an hour or two to eat, get cleaned up and dressed, and rush my errands before going to work. I wasted so much time obssessing over sex, feeling good, and pornography that I lost out on valuable time to find better jobs, finish my graduate thesis, and get myself healthy/in shape. Back in 2005-2007, there were times I would call in sick to work not only because I didn't want to be there, but so I could frequent adult stores, theaters, massage parlors, strip clubs, or hook up with people i met online. It was so destructive and I wasted so much money over the years.
I was so addicted to sex and pornography that I would keep pushing boundaries, just seeing how much was out there and what depraved acts could be easily found on the internet. It ended badly with legal problems and such. I went through a counseling program for sex offenders and have come out a better person. Mentally, I'm in a better place. Sure, i still struggle with temptation, but I am not in a place where sex and sex related things dominate my life. I learned to deal with why I let myself fall so far. I learned how to fulfill physical desires without harming myself (exercise, yardwork, reading, volunteering at church, etc). It will be something I will deal with my entire life but I know that I can deal with my failures and shortcomings, only by the grace of God.
I hope this sheds a sliver of light on sex addiction and what people deal with. I suggest looking for books on dealing with sex addiction at the local library. there are good resources out there and perhaps a visit with some sort of counselor or mentor could help if your boyfriend shows any symptoms like I described or what you may read about in articles/books. Feel free to send me a message with any further questions. Cheers and God Bless.