I love giving it too but my wife gets pretty self conscious about receiving it so doesn't happen as often as I would do it personally these days. For some reason shes also not very confident in her own skills (even though shes really good) and it has now been some years since shes had the confidence to do it but thats her choice.
Sex is also an important part of our relationship and my wifes sex drive is affected by her hormones. Sometimes she is completely insatiable and would go all day and others she would pull away from me even touching her so I have to work out the timings as im the main initiator.