My boyfriend and I have been together for about 5 months. At first for protection we used condoms but he couldn't stay hard with one on. After that we tried anal instead but I really don't enjoy that at all. So I went on birth control. Now most of the time it's not hard for him to get an erection, he just has trouble sustaining it. It also takes him a reallly long time to come. Is there anything I can do to help him?