whats TTC, please do tell me?
If you had an abortion with d&c and now that you are trying for a pregnancy, it would be prudent to be under care for a gynecologist. Sex is NOT only for conception , but also for personal pleasure.
But some events like an abortion can create setback in minds of both man or woman involved.
Erection has to be sustained to help semen to be deposited in vagina
For this he may have to visit a sexologist in your area. or a urologist
Next Steps
have an open discussion with your wife about your pregnancy. Though sex is essential for pregnancy , if the need be and if you feel that having baby is more important NOW, then go ahead with treatments where IUI can be done at ovulation